Hi,
I've just started to play with windows games (Steam, GOG, windows store) and find that the regaining focus back to Big Box on exit of a given game is very hit and miss and in fact is inconsistent.
I find that some on exit return focus 100% of the time and some are quite random, and it's not based on the source - so I see erratic behavior from Celeste (Steam) and Cuphead (Windows Store) - but 100% reliable functioning from GRIP and Gris (Steam).
I have setup an xpadder ALT/TAB button to let me regain focus, but the inconsistency is a little annoying.
sTeVE