Just thought I’d give everyone a heads up, since as we established earlier I’m not in habit of finding new features steam sneaks in. They’ve now made it possible to sort your library by… well library.
Edit: Well nothing’s perfect of course. If you do sort by library any game that isn’t in your own library vanishes from collections so you can’t sort games from shared libraries while also having them being split from your own. Even if the collection only contains titles from shared libraries.