🎨 Apply HAS_MULTI_HOTEND conditional

Marlin/src/lcd/e3v2/marlinui/ui_status_480x272.cpp

   }
 }
 
-#if HOTENDS > 2
-  #define HOTEND_STATS 3
-#elif HOTENDS > 1
-  #define HOTEND_STATS 2
-#elif HAS_HOTEND
-  #define HOTEND_STATS 1
-#endif
-
 /**
  * Draw a single heater icon with current and target temperature, at the given XY
  */
 FORCE_INLINE void _draw_heater_status(const heater_id_t heater, const uint16_t x, const uint16_t y) {
 
   #if HAS_HOTEND
+    #if HOTENDS > 2
+      #define HOTEND_STATS 3
+    #elif HOTENDS > 1
+      #define HOTEND_STATS 2
+    #elif HAS_HOTEND
+      #define HOTEND_STATS 1
+    #endif
     static celsius_t old_temp[HOTEND_STATS] = ARRAY_N_1(HOTEND_STATS, 500),
                      old_target[HOTEND_STATS] = ARRAY_N_1(HOTEND_STATS, 500);
     static bool old_on[HOTEND_STATS] = ARRAY_N_1(HOTEND_STATS, false);

Marlin/src/lcd/extui/dgus/DGUSScreenHandler.cpp

         case VP_E0_PID_I: valuesend = unscalePID_i(value); break;
         case VP_E0_PID_D: valuesend = unscalePID_d(value); break;
       #endif
-      #if HOTENDS >= 2
+      #if HAS_MULTI_HOTEND
         case VP_E1_PID_P: valuesend = value; break;
         case VP_E1_PID_I: valuesend = unscalePID_i(value); break;
         case VP_E1_PID_D: valuesend = unscalePID_d(value); break;
         acceptedvalue = thermalManager.degTargetHotend(0);
         break;
     #endif
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       case VP_T_E1_Set:
         NOMORE(newvalue, HEATER_1_MAXTEMP);
         thermalManager.setTargetHotend(newvalue, 1);
               sprintf_P(buf, PSTR("M303 E%d C5 S210 U1"), ExtUI::extruder_t::E0);
               break;
           #endif
-          #if HOTENDS >= 2
+          #if HAS_MULTI_HOTEND
             case VP_PID_AUTOTUNE_E1:
               sprintf_P(buf, PSTR("M303 E%d C5 S210 U1"), ExtUI::extruder_t::E1);
               break;
   switch (var.VP) {
     #if HAS_HOTEND
       case VP_E0_CONTROL:
-      #if HOTENDS >= 2
+      #if HAS_MULTI_HOTEND
         case VP_E1_CONTROL:
         #if HOTENDS >= 3
           case VP_E2_CONTROL:

Marlin/src/lcd/extui/dgus/fysetc/DGUSDisplayDef.cpp

   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set, VP_E0_STATUS,
   #endif
-  #if HOTENDS >= 2
+  #if HAS_MULTI_HOTEND
     VP_T_E1_Is, VP_T_E1_Set,
   #endif
   #if HAS_HEATED_BED
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
   #endif
-  #if HOTENDS >= 2
+  #if HAS_MULTI_HOTEND
     VP_T_E1_Is, VP_T_E1_Set,
   #endif
   #if HAS_HEATED_BED
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
   #endif
-  #if HOTENDS >= 2
+  #if HAS_MULTI_HOTEND
     VP_T_E1_Is, VP_T_E1_Set,
   #endif
   #if HAS_HEATED_BED
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
   #endif
-  #if HOTENDS >= 2
+  #if HAS_MULTI_HOTEND
     VP_T_E1_Is, VP_T_E1_Set,
   #endif
   #if HAS_HEATED_BED
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
   #endif
-  #if HOTENDS >= 2
+  #if HAS_MULTI_HOTEND
     VP_T_E1_Is, VP_T_E1_Set,
   #endif
   #if HAS_HEATED_BED
       VPHELPER(VP_E0_FILAMENT_LOAD_UNLOAD, nullptr, ScreenHandler.HandleFilamentOption, ScreenHandler.HandleFilamentLoadUnload),
     #endif
   #endif
-  #if HOTENDS >= 2
+  #if HAS_MULTI_HOTEND
     VPHELPER(VP_T_E1_Is, &thermalManager.temp_hotend[1].celsius, nullptr, ScreenHandler.DGUSLCD_SendFloatAsLongValueToDisplay<0>),
     VPHELPER(VP_T_E1_Set, &thermalManager.temp_hotend[1].target, ScreenHandler.HandleTemperatureChanged, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
     VPHELPER(VP_Flowrate_E1, &planner.flow_percentage[ExtUI::extruder_t::E1], ScreenHandler.HandleFlowRateChanged, ScreenHandler.DGUSLCD_SendWordValueToDisplay),  // ERROR: Flow is per-extruder, not per-hotend

Marlin/src/lcd/extui/dgus/fysetc/DGUSScreenHandler.cpp

           case VP_E0_PID_I: newvalue = scalePID_i(value); break;
           case VP_E0_PID_D: newvalue = scalePID_d(value); break;
         #endif
-        #if HOTENDS >= 2
+        #if HAS_MULTI_HOTEND
           case VP_E1_PID_P: newvalue = value; break;
           case VP_E1_PID_I: newvalue = scalePID_i(value); break;
           case VP_E1_PID_D: newvalue = scalePID_d(value); break;
       #if HAS_HOTEND
         thermalManager.setTargetHotend(e_temp, ExtUI::extruder_t::E0);
       #endif
-      #if HOTENDS >= 2
+      #if HAS_MULTI_HOTEND
         thermalManager.setTargetHotend(e_temp, ExtUI::extruder_t::E1);
       #endif
       GotoScreen(DGUSLCD_SCREEN_UTILITY);

Marlin/src/lcd/extui/dgus/hiprecy/DGUSDisplayDef.cpp

   // VP_M117, for completeness, but it cannot be auto-uploaded.
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set, VP_E0_STATUS,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
 const uint16_t VPList_Temp[] PROGMEM = {
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
   // VP_M117, for completeness, but it cannot be auto-uploaded
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
   // VP_M117, for completeness, but it cannot be auto-uploaded
   #if HAS_HOTEND
     VP_Flowrate_E0,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_Flowrate_E1,
     #endif
   #endif
 const uint16_t VPList_Preheat[] PROGMEM = {
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
 const uint16_t VPList_ManualExtrude[] PROGMEM = {
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
     VP_E0_FILAMENT_LOAD_UNLOAD,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
 const uint16_t VPList_Filament_load_unload[] PROGMEM = {
   #if HAS_HOTEND
     VP_E0_FILAMENT_LOAD_UNLOAD,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_E1_FILAMENT_LOAD_UNLOAD,
     #endif
   #endif
   VP_PrintProgress_Percentage, VP_PrintTime,
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
 const uint16_t VPList_SDPrintTune[] PROGMEM = {
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
 };
 
 const uint16_t VPList_StepPerMM[] PROGMEM = {
-  VP_X_STEP_PER_MM,
-  VP_Y_STEP_PER_MM,
-  VP_Z_STEP_PER_MM,
-  #if HAS_HOTEND
-    VP_E0_STEP_PER_MM,
-    #if HOTENDS >= 2
-      VP_E1_STEP_PER_MM,
-    #endif
-  #endif
-  0x0000
+  VP_X_STEP_PER_MM
+  , VP_Y_STEP_PER_MM
+  , VP_Z_STEP_PER_MM
+  OPTARG(HAS_HOTEND,       VP_E0_STEP_PER_MM)
+  OPTARG(HAS_MULTI_HOTEND, VP_E1_STEP_PER_MM)
+  , 0x0000
 };
 
 const uint16_t VPList_PIDE0[] PROGMEM = {
   #if ENABLED(PIDTEMP)
-    VP_E0_PID_P,
-    VP_E0_PID_I,
-    VP_E0_PID_D,
+    VP_E0_PID_P, VP_E0_PID_I, VP_E0_PID_D,
   #endif
   0x0000
 };
       VPHELPER(VP_PID_AUTOTUNE_E0, nullptr, ScreenHandler.HandlePIDAutotune, nullptr),
     #endif
   #endif
-  #if HOTENDS >= 2
+  #if HAS_MULTI_HOTEND
     VPHELPER(VP_T_E1_Is, &thermalManager.temp_hotend[1].celsius, nullptr, ScreenHandler.DGUSLCD_SendFloatAsLongValueToDisplay<0>),
     VPHELPER(VP_T_E1_Set, &thermalManager.temp_hotend[1].target, ScreenHandler.HandleTemperatureChanged, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
     VPHELPER(VP_Flowrate_E1, nullptr, ScreenHandler.HandleFlowRateChanged, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
   VPHELPER(VP_Z_STEP_PER_MM, &planner.settings.axis_steps_per_mm[Z_AXIS], ScreenHandler.HandleStepPerMMChanged, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<1>),
   #if HAS_HOTEND
     VPHELPER(VP_E0_STEP_PER_MM, &planner.settings.axis_steps_per_mm[E_AXIS_N(0)], ScreenHandler.HandleStepPerMMExtruderChanged, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<1>),
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VPHELPER(VP_E1_STEP_PER_MM, &planner.settings.axis_steps_per_mm[E_AXIS_N(1)], ScreenHandler.HandleStepPerMMExtruderChanged, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<1>),
     #endif
   #endif

Marlin/src/lcd/extui/dgus/hiprecy/DGUSScreenHandler.cpp

           case VP_E0_PID_I: newvalue = scalePID_i(value); break;
           case VP_E0_PID_D: newvalue = scalePID_d(value); break;
         #endif
-        #if HOTENDS >= 2
+        #if HAS_MULTI_HOTEND
           case VP_E1_PID_P: newvalue = value; break;
           case VP_E1_PID_I: newvalue = scalePID_i(value); break;
           case VP_E1_PID_D: newvalue = scalePID_d(value); break;
     if (filament_data.action == 0) { // Go back to utility screen
       #if HAS_HOTEND
         thermalManager.setTargetHotend(e_temp, ExtUI::extruder_t::E0);
-        #if HOTENDS >= 2
+        #if HAS_MULTI_HOTEND
           thermalManager.setTargetHotend(e_temp, ExtUI::extruder_t::E1);
         #endif
       #endif
               thermalManager.setTargetHotend(e_temp, filament_data.extruder);
               break;
           #endif
-          #if HOTENDS >= 2
+          #if HAS_MULTI_HOTEND
             case VP_E1_FILAMENT_LOAD_UNLOAD:
               filament_data.extruder = ExtUI::extruder_t::E1;
               thermalManager.setTargetHotend(e_temp, filament_data.extruder);

Marlin/src/lcd/extui/dgus/mks/DGUSDisplayDef.cpp

   // VP_M117, for completeness, but it cannot be auto-uploaded.
   #if HAS_HOTEND
     MKSLIST_E_ITEM(0) VP_E0_STATUS,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       MKSLIST_E_ITEM(1) VP_E1_STATUS,
     #endif
   #endif
     #endif
   #endif
 
-  #if HOTENDS >= 2
+  #if HAS_MULTI_HOTEND
     VPHELPER(VP_T_E1_Is, &thermalManager.temp_hotend[1].celsius, nullptr, ScreenHandler.DGUSLCD_SendFloatAsLongValueToDisplay<0>),
     VPHELPER(VP_T_E1_Set, &thermalManager.temp_hotend[1].target, ScreenHandler.HandleTemperatureChanged, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
     VPHELPER(VP_Flowrate_E1, &planner.flow_percentage[ExtUI::extruder_t::E1], ScreenHandler.HandleFlowRateChanged, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
 
   #if HAS_HOTEND
     VPHELPER(VP_E0_MAX_SPEED, &planner.settings.max_feedrate_mm_s[E_AXIS_N(0)], ScreenHandler.HandleExtruderMaxSpeedChange_MKS, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<0>),
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VPHELPER(VP_E1_MAX_SPEED, &planner.settings.max_feedrate_mm_s[E_AXIS_N(1)], ScreenHandler.HandleExtruderMaxSpeedChange_MKS, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<0>),
     #endif
   #endif
 
   #if HAS_HOTEND
     VPHELPER(VP_E0_ACC_MAX_SPEED, (uint16_t *)&planner.settings.max_acceleration_mm_per_s2[E_AXIS_N(0)], ScreenHandler.HandleExtruderAccChange_MKS, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VPHELPER(VP_E1_ACC_MAX_SPEED, (uint16_t *)&planner.settings.max_acceleration_mm_per_s2[E_AXIS_N(1)], ScreenHandler.HandleExtruderAccChange_MKS, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
     #endif
   #endif
 
   #if HAS_HOTEND
     VPHELPER(VP_E0_STEP_PER_MM, &planner.settings.axis_steps_per_mm[E_AXIS_N(0)], ScreenHandler.HandleStepPerMMExtruderChanged_MKS, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<0>),
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VPHELPER(VP_E1_STEP_PER_MM, &planner.settings.axis_steps_per_mm[E_AXIS_N(1)], ScreenHandler.HandleStepPerMMExtruderChanged_MKS, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<0>),
     #endif
   #endif

Marlin/src/lcd/extui/dgus/origin/DGUSDisplayDef.cpp

 const uint16_t VPList_Temp[] PROGMEM = {
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
   // VP_M117, for completeness, but it cannot be auto-uploaded
   #if HAS_HOTEND
     VP_T_E0_Is, VP_T_E0_Set,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_T_E1_Is, VP_T_E1_Set,
     #endif
   #endif
   // VP_M117, for completeness, but it cannot be auto-uploaded
   #if HAS_HOTEND
     VP_Flowrate_E0,
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VP_Flowrate_E1,
     #endif
   #endif
       VPHELPER(VP_E0_FILAMENT_LOAD_UNLOAD, nullptr, ScreenHandler.HandleFilamentOption, ScreenHandler.HandleFilamentLoadUnload),
     #endif
   #endif
-  #if HOTENDS >= 2
+  #if HAS_MULTI_HOTEND
     VPHELPER(VP_T_E1_Is, &thermalManager.temp_hotend[1].celsius, nullptr, ScreenHandler.DGUSLCD_SendFloatAsLongValueToDisplay<0>),
     VPHELPER(VP_T_E1_Set, &thermalManager.temp_hotend[1].target, ScreenHandler.HandleTemperatureChanged, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
     VPHELPER(VP_Flowrate_E1, nullptr, ScreenHandler.HandleFlowRateChanged, ScreenHandler.DGUSLCD_SendWordValueToDisplay),
   VPHELPER(VP_Z_STEP_PER_MM, &planner.settings.axis_steps_per_mm[Z_AXIS], ScreenHandler.HandleStepPerMMChanged, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<1>),
   #if HAS_HOTEND
     VPHELPER(VP_E0_STEP_PER_MM, &planner.settings.axis_steps_per_mm[E_AXIS_N(0)], ScreenHandler.HandleStepPerMMExtruderChanged, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<1>),
-    #if HOTENDS >= 2
+    #if HAS_MULTI_HOTEND
       VPHELPER(VP_E1_STEP_PER_MM, &planner.settings.axis_steps_per_mm[E_AXIS_N(1)], ScreenHandler.HandleStepPerMMExtruderChanged, ScreenHandler.DGUSLCD_SendFloatAsIntValueToDisplay<1>),
     #endif
   #endif

Marlin/src/lcd/extui/dgus/origin/DGUSScreenHandler.cpp

           case VP_E0_PID_I: newvalue = scalePID_i(value); break;
           case VP_E0_PID_D: newvalue = scalePID_d(value); break;
         #endif
-        #if HOTENDS >= 2
+        #if HAS_MULTI_HOTEND
           case VP_E1_PID_P: newvalue = value; break;
           case VP_E1_PID_I: newvalue = scalePID_i(value); break;
           case VP_E1_PID_D: newvalue = scalePID_d(value); break;
     if (filament_data.action == 0) { // Go back to utility screen
       #if HAS_HOTEND
         thermalManager.setTargetHotend(e_temp, ExtUI::extruder_t::E0);
-        #if HOTENDS >= 2
+        #if HAS_MULTI_HOTEND
           thermalManager.setTargetHotend(e_temp, ExtUI::extruder_t::E1);
         #endif
       #endif
               thermalManager.setTargetHotend(e_temp, filament_data.extruder);
               break;
           #endif
-          #if HOTENDS >= 2
+          #if HAS_MULTI_HOTEND
             case VP_E1_FILAMENT_LOAD_UNLOAD:
               filament_data.extruder = ExtUI::extruder_t::E1;
               thermalManager.setTargetHotend(e_temp, filament_data.extruder);

Marlin/src/lcd/extui/dgus_reloaded/DGUSRxHandler.cpp

     case DGUS_Addr::TEMP_SetTarget_H0:
       ExtUI::setTargetTemp_celsius(temp, ExtUI::H0);
       break;
-    #if HOTENDS > 1
+    #if HAS_MULTI_HOTEND
       case DGUS_Addr::TEMP_SetTarget_H1:
         ExtUI::setTargetTemp_celsius(temp, ExtUI::H1);
         break;
     case DGUS_Data::Heater::ALL:
       ExtUI::setTargetTemp_celsius(0, ExtUI::BED);
       ExtUI::setTargetTemp_celsius(0, ExtUI::H0);
-      #if HOTENDS > 1
+      #if HAS_MULTI_HOTEND
         ExtUI::setTargetTemp_celsius(0, ExtUI::H1);
       #endif
       break;
     case DGUS_Data::Heater::H0:
       ExtUI::setTargetTemp_celsius(0, ExtUI::H0);
       break;
-    #if HOTENDS > 1
+    #if HAS_MULTI_HOTEND
       case DGUS_Data::Heater::H1:
         ExtUI::setTargetTemp_celsius(0, ExtUI::H1);
         break;
       dgus_screen_handler.pid_heater = heater;
       break;
     case DGUS_Data::Heater::H0:
-    #if HOTENDS > 1
+    #if HAS_MULTI_HOTEND
       case DGUS_Data::Heater::H1:
     #endif
       dgus_screen_handler.pid_temp = DGUS_PLA_TEMP_HOTEND;
     case DGUS_Data::Heater::H0:
       temp = constrain(temp, HEATER_0_MINTEMP, (HEATER_0_MAXTEMP - HOTEND_OVERSHOOT));
       break;
-    #if HOTENDS > 1
+    #if HAS_MULTI_HOTEND
       case DGUS_Data::Heater::H1:
         temp = constrain(temp, HEATER_1_MINTEMP, (HEATER_1_MAXTEMP - HOTEND_OVERSHOOT));
         break;
         dgus_screen_handler.SetStatusMessage(F("PID disabled"));
         return;
       #endif
-    #if HOTENDS > 1
+    #if HAS_MULTI_HOTEND
       case DGUS_Data::Heater::H1:
         #if ENABLED(PIDTEMP)
           heater = H_E1;

Marlin/src/lcd/extui/dgus_reloaded/DGUSTxHandler.cpp

     case DGUS_Addr::TEMP_Max_H0:
       temp = HEATER_0_MAXTEMP - HOTEND_OVERSHOOT;
       break;
-    #if HOTENDS > 1
+    #if HAS_MULTI_HOTEND
       case DGUS_Addr::TEMP_Max_H1:
         temp = HEATER_1_MAXTEMP - HOTEND_OVERSHOOT;
         break;
       case DGUS_Data::Heater::H0:
         value = ExtUI::getPIDValues_Kp(ExtUI::E0);
         break;
-      #if HOTENDS > 1
+      #if HAS_MULTI_HOTEND
         case DGUS_Data::Heater::H1:
           value = ExtUI::getPIDValues_Kp(ExtUI::E1);
           break;
       case DGUS_Data::Heater::H0:
         value = ExtUI::getPIDValues_Ki(ExtUI::E0);
         break;
-      #if HOTENDS > 1
+      #if HAS_MULTI_HOTEND
         case DGUS_Data::Heater::H1:
           value = ExtUI::getPIDValues_Ki(ExtUI::E1);
           break;
       case DGUS_Data::Heater::H0:
         value = ExtUI::getPIDValues_Kd(ExtUI::E0);
         break;
-      #if HOTENDS > 1
+      #if HAS_MULTI_HOTEND
         case DGUS_Data::Heater::H1:
           value = ExtUI::getPIDValues_Kd(ExtUI::E1);
           break;

Marlin/src/lcd/extui/dgus_reloaded/config/DGUS_Addr.h

   TEMP_Preset               = 0x2010, // Popup / Data: DGUS_Data::TempPreset
   TEMP_SetTarget_Bed        = 0x2011, // Type: Integer (16 bits signed)
   TEMP_SetTarget_H0         = 0x2012, // Type: Integer (16 bits signed)
-  #if HOTENDS > 1
+  #if HAS_MULTI_HOTEND
     TEMP_SetTarget_H1       = 0x2013, // Type: Integer (16 bits signed)
   #endif
   TEMP_Cool                 = 0x2014, // Data: DGUS_Data::Heater
   TEMP_Current_H0           = 0x30FF, // Type: Integer (16 bits signed)
   TEMP_Target_H0            = 0x3100, // Type: Integer (16 bits signed)
   TEMP_Max_H0               = 0x3101, // Type: Integer (16 bits unsigned)
-  #if HOTENDS > 1
+  #if HAS_MULTI_HOTEND
     TEMP_Current_H1         = 0x3102, // Type: Integer (16 bits signed)
     TEMP_Target_H1          = 0x3103, // Type: Integer (16 bits signed)
     TEMP_Max_H1             = 0x3104, // Type: Integer (16 bits unsigned)

Marlin/src/lcd/extui/dgus_reloaded/definition/DGUS_VPList.cpp

   VP_HELPER_RX(DGUS_Addr::TEMP_Preset,        &DGUSRxHandler::TempPreset),
   VP_HELPER_RX(DGUS_Addr::TEMP_SetTarget_Bed, &DGUSRxHandler::TempTarget),
   VP_HELPER_RX(DGUS_Addr::TEMP_SetTarget_H0,  &DGUSRxHandler::TempTarget),
-  #if HOTENDS > 1
+  #if HAS_MULTI_HOTEND
     VP_HELPER_RX(DGUS_Addr::TEMP_SetTarget_H1,  &DGUSRxHandler::TempTarget),
   #endif
   VP_HELPER_RX(DGUS_Addr::TEMP_Cool,          &DGUSRxHandler::TempCool),
                     &thermalManager.temp_hotend[ExtUI::heater_t::H0].target,
                     &DGUSTxHandler::ExtraToInteger<int16_t>),
   VP_HELPER_TX(DGUS_Addr::TEMP_Max_H0, &DGUSTxHandler::TempMax),
-  #if HOTENDS > 1
+  #if HAS_MULTI_HOTEND
     VP_HELPER_TX_AUTO(DGUS_Addr::TEMP_Current_H1,
                       &thermalManager.temp_hotend[ExtUI::heater_t::H1].celsius,
                       &DGUSTxHandler::ExtraToInteger<float>),

Marlin/src/lcd/menu/menu_temperature.cpp

 
         HOTEND_LOOP() PREHEAT_ITEMS(editable.int8, e);
         ACTION_ITEM_S(ui.get_preheat_label(m), MSG_PREHEAT_M_ALL, []() {
-          HOTEND_LOOP() thermalManager.setTargetHotend(ui.material_preset[editable.int8].hotend_temp, e);
+          const celsius_t t = ui.material_preset[editable.int8].hotend_temp;
+          HOTEND_LOOP() thermalManager.setTargetHotend(t, e);
           TERN(HAS_HEATED_BED, _preheat_bed(editable.int8), ui.return_to_status());
         });
 
     //
     LOOP_L_N(m, PREHEAT_COUNT) {
       editable.int8 = m;
-      #if HOTENDS > 1 || HAS_HEATED_BED
+      #if HAS_MULTI_HOTEND || HAS_HEATED_BED
         SUBMENU_S(ui.get_preheat_label(m), MSG_PREHEAT_M, menu_preheat_m);
       #elif HAS_HOTEND
         ACTION_ITEM_S(ui.get_preheat_label(m), MSG_PREHEAT_M, do_preheat_end_m);
 
     LOOP_L_N(m, PREHEAT_COUNT) {
       editable.int8 = m;
-      #if HOTENDS > 1 || HAS_HEATED_BED
+      #if HAS_MULTI_HOTEND || HAS_HEATED_BED
         SUBMENU_S(ui.get_preheat_label(m), MSG_PREHEAT_M, menu_preheat_m);
       #else
         ACTION_ITEM_S(ui.get_preheat_label(m), MSG_PREHEAT_M, do_preheat_end_m);

Marlin/src/lcd/tft/ui_common.h

 
 #define ABSOLUTE_ZERO     -273.15
 
-#if HAS_TEMP_CHAMBER && HOTENDS > 1
+#if HAS_TEMP_CHAMBER && HAS_MULTI_HOTEND
   #define ITEM_E0         0
   #define ITEM_E1         1
   #define ITEM_BED        2
   #define ITEM_COOLER     0
   #define ITEM_FAN        1
   #define ITEMS_COUNT     2
-#elif HOTENDS > 1
+#elif HAS_MULTI_HOTEND
   #define ITEM_E0         0
   #define ITEM_E1         1
   #define ITEM_BED        2

Marlin/src/pins/esp32/pins_E4D.h

 
 #if EXTRUDERS > 1 || E_STEPPERS > 1
   #error "E4d@box only supports one E Stepper. Comment out this line to continue."
-#elif HOTENDS > 1
+#elif HAS_MULTI_HOTEND
   #error "E4d@box only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/esp32/pins_FYSETC_E4.h

 
 #if EXTRUDERS > 1 || E_STEPPERS > 1
   #error "FYSETC E4 only supports one E Stepper. Comment out this line to continue."
-#elif HOTENDS > 1
+#elif HAS_MULTI_HOTEND
   #error "FYSETC E4 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/esp32/pins_MRR_ESPA.h

 
 #if EXTRUDERS > 1 || E_STEPPERS > 1
   #error "MRR ESPA only supports one E Stepper. Comment out this line to continue."
-#elif HOTENDS > 1
+#elif HAS_MULTI_HOTEND
   #error "MRR ESPA only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/esp32/pins_MRR_ESPE.h

 
 #if EXTRUDERS > 2 || E_STEPPERS > 2
   #error "MRR ESPE only supports two E Steppers. Comment out this line to continue."
-#elif HOTENDS > 1
+#elif HAS_MULTI_HOTEND
   #error "MRR ESPE only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/ramps/pins_K8600.h

  * VERTEX NANO Arduino Mega with RAMPS EFB v1.4 pin assignments.
  */
 
-#if HOTENDS > 1
+#if HAS_MULTI_HOTEND
   #error "Only 1 hotend is supported for Vertex Nano."
 #endif
 

Marlin/src/pins/ramps/pins_LONGER3D_LKx_PRO.h

 #define REQUIRE_MEGA2560
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "Longer3D LGT KIT V1.0 board only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/ramps/pins_RAMPS_ENDER_4.h

  */
 #pragma once
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "Ender-4 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_CCROBOT_MEEB_3DP.h

 
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "CCROBOT-ONLINE MEEB_3DP only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_CREALITY_V4.h

 
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "Creality V4 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_CREALITY_V4210.h

 
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "CREALITY supports up to 1 hotends / E-steppers. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_CREALITY_V452.h

  * Creality v4.5.2 (STM32F103RET6) board pin assignments
  */
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "Creality v4.5.2 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_CREALITY_V453.h

  * Creality v4.5.3 (STM32F103RET6) board pin assignments
  */
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "Creality v4.5.3 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_FLSUN_HISPEED.h

 
 #if NOT_TARGET(__STM32F1__, STM32F1xx)
   #error "Oops! Select an STM32F1 board in 'Tools > Board.'"
-#elif HOTENDS > 1 || E_STEPPERS > 1
+#elif HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "FLSUN HiSpeedV1 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_JGAURORA_A5S_A1.h

 
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "JGAurora A5S A1 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_LONGER3D_LK.h

 
 #if NOT_TARGET(__STM32F1__, STM32F1xx)
   #error "Oops! Select a STM32F1 board in 'Tools > Board.'"
-#elif HOTENDS > 1 || E_STEPPERS > 1
+#elif HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "Longer3D only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3.h

  * MKS Robin E3 (STM32F103RCT6) board pin assignments
  */
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "MKS Robin E3 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3D.h

  * MKS Robin E3D (STM32F103RCT6) board pin assignments
  */
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "MKS Robin E3D only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3D_V1_1.h

  * MKS Robin E3D v1.1 (STM32F103RCT6) board pin assignments
  */
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "MKS Robin E3D v1.1 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3P.h

 
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "MKS Robin E3P only supports one hotend / E-stepper. Comment out this line to continue."
 #elif HAS_FSMC_TFT
   #error "MKS Robin E3P doesn't support FSMC-based TFT displays."

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3_V1_1.h

  * MKS Robin E3 v1.1 (STM32F103RCT6) board pin assignments
  */
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "MKS Robin E3 v1.1 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_LITE.h

 
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "MKS Robin Lite only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_MINI.h

 
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "MKS Robin mini only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f4/pins_ANET_ET4.h

 
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "Anet ET4 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f4/pins_BTT_BTT002_V1_0.h

 
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "BIGTREE BTT002 V1.0 only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f4/pins_LERDGE_X.h

 #define ALLOW_STM32DUINO
 #include "env_validate.h"
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "LERDGE X only supports one hotend / E-stepper. Comment out this line to continue."
 #endif
 

Marlin/src/pins/stm32f7/pins_REMRAM_V1.h

   #define SRAM_EEPROM_EMULATION                   // Emulate the EEPROM using Backup SRAM
 #endif
 
-#if HOTENDS > 1 || E_STEPPERS > 1
+#if HAS_MULTI_HOTEND || E_STEPPERS > 1
   #error "RemRam only supports one hotend / E-stepper. Comment out this line to continue."
 #endif