Nope.
You can create a "Favourites" category and not have the games you don't want be part of that list, therefore hidden in a respect, but you can't remove them from your library totally once a game has been activated.
Hmm. Sounds like i'll have to do that then. It's not even as if i play anything at the moment. I've just bought far too many cheap bundles leaving my list is too long and i've grown out of the "lol get my steam games count up" phase.
Pretty obvious OP has purchased 'Leisure Suit Larry' and needs to find a way of hiding it![]()