I use game pass every single day, I know how it works. I wanted to play Halo, I needed to download the Master Chief Collection INDIVIDUALLY, I wanted to play Classic DOOM, I had to download that individually, I wanted to play Medium, I had to download that individually. I wanted to play Alien Isolation, guess what I had to download that individually. And I had those icons on my desktop on PC and individually selectable on Xbox. This isn't like the Namco collection where you just launch one "game" and see a browser of games to play.
So they are already individual apps. I can uninstall Halo but keep Medium installed.