Hi, from GDevelop 5.3.189 onward Buttons objects in Scene Editor are always on top of other objects, Z Order is ignored
[EDIT: Also Sliders have the same problem, so perhaps all Custom Objects have this strange and confusing behavior - see next post]
In project preview (tested in actual version 5.3.194) Z Order is ok
[Windows desktop version - GDevelop-5-Setup-5.3.194.exe]
[Thanks to Tiny Sword for detecting the buttons problem]