GoleMMan: I removed the integrations, but that doesn't take the games out of the DB.
Ice_Mage: Did you try clicking Sync Integrations in the cogwheel menu?
If that doesn't help, try starting over with a fresh database:
1. Exit GOG Galaxy.
2. Start File Explorer and enter the following in the address bar:
%AllUsersProfile%\GOG.com\Galaxy 3. Delete the
storage folder.
4. When you next start GOG Galaxy, it will import your owned games. To add installed games, click the cogwheel and choose Add Games & Friends, then Scan Folders for GOG Games.
That did not work for me. I wasn't expecting it to, because this GOG install was a fresh one anyway, so the stored games from the DB must have been pulled from cloud storage in the first place. But yeah, even with no integrations, having synced integrations and having deleted the storage folder I'm still seeing Steam games.
It could be due to me having added metadata for physical games manually, but it's still a pain. On this clean pass it took over ten minutes to rebuild the db even on a very high end desktop PC with a fast internet connection, and it takes a good one or two minutes on a normal boot despite the db being cached.
The attempt did make it forget the games I had installed, though, so there's that :D
To Anidais' point, it's frustrating to see them patch in more ads to the "Discover" tab, which they keep bugging me about with surveys and not have the thing that makes the app fundamentally unusable addressed.