My understanding of that disabled red box event is it’s checking if the cursor is not on a Group_Toolbar_Background object. The thing is, if there are 2 or more group objects in the scene, and the mouse is over one of them, then it’s not over the other one, and so the condition is true.
What you’re after is the NOT condition, and use the “Cursor is on a Group_Toolbar_Background object” as it’s subcondition:
Yes this was intentional, this comes from the gdevelop pre-build example of the citybuilder, and the aim is to be able to rotate the camera if the cursor is NOT on a toolbar in the original example.
I now understand the explanation, even if I thought the cursor/touch event is active on any object being covered. No I have applied your solution and it works.