Simulator device icon, how to get it visible again


I’ve installed a parent-child app and some simulated switches. When installing them with “install” i got a visual icon for at least one of those switches in the middle right side which I could push.
But now the apps seem to be running and I like to turn one of the switches off to see whether my apps will react correctly. But … how do I do that?
PS: I know this stuff is classic and I should not use it anymore, but IDE/simulator do have a usefulness and beauty not found in the smartthings-cloud-new-stuff, yet….

Thanks in advance.