should work now

Source/Editor/CustomEditors/Dedicated/UIControlEditor.cs

@@ -306,6 +306,29 @@ namespace FlaxEditor.CustomEditors.Dedicated
                 return;
             SetValue(control.Tag);
         }
+        /// <inheritdoc/>
+        protected override void SynchronizeValue(object value)
+        {
+            // Custom anchors editing for Control to handle bounds preservation via key modifiers
+            if (ParentEditor != null)
+            {
+                var centerToPosition = Input.GetKey(KeyboardKeys.Shift);
+                var setPivot = Input.GetKey(KeyboardKeys.Control);
+                var editedAny = false;
+                foreach (var parentValue in ParentEditor.Values)
+                {
+                    if (parentValue is Control parentControl)
+                    {
+                        parentControl.SetAnchorPreset((AnchorPresets)value, centerToPosition, setPivot);
+                        editedAny = true;
+                    }
+                }
+                if (editedAny)
+                    return;
+            }
+
+            base.SynchronizeValue(value);
+        }
 
         /// <inheritdoc />
         public override void Refresh()

Source/Engine/UI/GUI/Control.Bounds.cs.rej

@@ -0,0 +1,17 @@
+diff a/Source/Engine/UI/GUI/Control.Bounds.cs b/Source/Engine/UI/GUI/Control.Bounds.cs	(rejected hunks)
+@@ -485,13 +485,13 @@
+ 
+                         _anchorMin = anchorMin;
+                         _anchorMax = anchorMax;
+-                        if (preserveBounds)
++                        if (!centerToPosition)
+                         {
+                             UpdateBounds();
+                             Bounds = bounds;
+                         }
+                     }
+-                    if (!preserveBounds)
++                    if (centerToPosition)
+                     {
+                         if (_parent != null)
+                         {

Source/Engine/UI/GUI/Control.cs

@@ -193,7 +193,7 @@ namespace FlaxEngine.GUI
                 }
                 return result;
             }
-            set => SetAnchorPreset(value, Input.GetKey(KeyboardKeys.Shift), Input.GetKey(KeyboardKeys.Control));
+            set => SetAnchorPreset(value, true, false);
         }
 
         /// <summary>