I just hide everything I don't want to play again. "Favorites" means "games I am playing right now". I have one real category of my own, which is "Finished", and actually means "maybe I beat this, or maybe I just got close enough and watched the ending on Youtube." Very few games are actually visible in "Finished" because mostly I don't replay games, so if I beat something, it goes into "Finished" and then gets hidden.