Hello,
Sorry to hear you are having trouble.
While a bit hard to follow, I (we) can't seem to reproduce your issue.
In this example, I have multiple other apps open in the background and maximized (all typical: WinExp, NotePad, additional Chrome window with multiple tabs of it open).
https://cdn.stardock.us/support/uploads/2019-11-08_11-32-46.mp4
I don't see any options in groupy that I have set that would look to be preventing this functionality.
Well, let's eliminate that (or any other) possibility with the Purge / Reinstall and keeping the default settings:
https://forums.stardock.com/488142/groupy-support-faq#reinstalling
Sean Drohan
Stardock Support Manager