Do you mean something like:
+ MouseKeyboard: On key F8 pressed
-> System: Set Layer "Debug" opacity to 100
-> HBox: Make Visible
-> FloorDetect: Make Visible
-> Yellow: Make Visible
-> Sprite3: Make Visible
Above code is from a working 'Debug' screen that shows when F8 is pressed.
If your vision so exceeds your ability, then look to something closer.