Define GRID_MAX_POINTS

Marlin/Conditionals_post.h

     #endif
   #endif
 
+  // Shorthand
+  #define GRID_MAX_POINTS ((GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y))
+
 #endif // CONDITIONALS_POST_H

Marlin/Marlin_main.cpp

           #endif
         }
         // If there's another point to sample, move there with optional lift.
-        if (mbl_probe_index < (GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y)) {
+        if (mbl_probe_index < GRID_MAX_POINTS) {
           mbl.zigzag(mbl_probe_index, px, py);
           _manual_goto_xy(mbl.index_to_xpos[px], mbl.index_to_ypos[py]);
 
       ABL_VAR int left_probe_bed_position, right_probe_bed_position, front_probe_bed_position, back_probe_bed_position;
       ABL_VAR float xGridSpacing, yGridSpacing;
 
-      #define ABL_GRID_MAX (GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y)
-
       #if ABL_PLANAR
         ABL_VAR uint8_t abl_grid_points_x = GRID_MAX_POINTS_X,
                         abl_grid_points_y = GRID_MAX_POINTS_Y;
         #if ABL_PLANAR
           ABL_VAR int abl2;
         #else // 3-point
-          int constexpr abl2 = ABL_GRID_MAX;
+          int constexpr abl2 = GRID_MAX_POINTS;
         #endif
       #endif
 
 
         ABL_VAR int indexIntoAB[GRID_MAX_POINTS_X][GRID_MAX_POINTS_Y];
 
-        ABL_VAR float eqnAMatrix[ABL_GRID_MAX * 3], // "A" matrix of the linear system of equations
-                     eqnBVector[ABL_GRID_MAX],     // "B" vector of Z points
+        ABL_VAR float eqnAMatrix[GRID_MAX_POINTS * 3], // "A" matrix of the linear system of equations
+                     eqnBVector[GRID_MAX_POINTS],     // "B" vector of Z points
                      mean;
       #endif
 

Marlin/configuration_store.cpp

     #if ENABLED(MESH_BED_LEVELING)
       // Compile time test that sizeof(mbl.z_values) is as expected
       static_assert(
-        sizeof(mbl.z_values) == (GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y) * sizeof(mbl.z_values[0][0]),
+        sizeof(mbl.z_values) == GRID_MAX_POINTS * sizeof(mbl.z_values[0][0]),
         "MBL Z array is the wrong size."
       );
       const bool leveling_is_on = TEST(mbl.status, MBL_STATUS_HAS_MESH_BIT);
     #if ENABLED(AUTO_BED_LEVELING_BILINEAR)
       // Compile time test that sizeof(z_values) is as expected
       static_assert(
-        sizeof(z_values) == (GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y) * sizeof(z_values[0][0]),
+        sizeof(z_values) == GRID_MAX_POINTS * sizeof(z_values[0][0]),
         "Bilinear Z array is the wrong size."
       );
       const uint8_t grid_max_x = GRID_MAX_POINTS_X, grid_max_y = GRID_MAX_POINTS_Y;

Marlin/ubl_G29.cpp

 
     repeat_flag = code_seen('R');
     if (repeat_flag) {
-      repetition_cnt = code_has_value() ? code_value_int() : (GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y);
-      repetition_cnt = min(repetition_cnt, (GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y));
+      repetition_cnt = code_has_value() ? code_value_int() : GRID_MAX_POINTS;
+      NOMORE(repetition_cnt, GRID_MAX_POINTS);
       if (repetition_cnt < 1) {
         SERIAL_PROTOCOLLNPGM("?(R)epetition count invalid (1+).\n");
         return UBL_ERR;

Marlin/ultralcd.cpp

     #endif
 
     // LCD probed points are from defaults
-    constexpr uint8_t total_probe_points =
-      #if ABL_GRID
-        (GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y)
-      #elif ENABLED(AUTO_BED_LEVELING_3POINT)
-        int(3)
-      #elif ENABLED(AUTO_BED_LEVELING_UBL)
-        (GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y)
-      #elif ENABLED(MESH_BED_LEVELING)
-        (GRID_MAX_POINTS_X) * (GRID_MAX_POINTS_Y)
+    constexpr uint8_t total_probe_points = (
+      #if ENABLED(AUTO_BED_LEVELING_3POINT)
+        3
+      #elif ABL_GRID || ENABLED(AUTO_BED_LEVELING_UBL) || ENABLED(MESH_BED_LEVELING)
+        GRID_MAX_POINTS
       #endif
-    ;
+    );
 
     #if ENABLED(MESH_BED_LEVELING)