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where can I see the update status of non-gog games (Steam, Origin, Epic and so on) in Galaxy 2.0? I have not noticed any updates yet, it seems like games only updating when I try to start them.

Is there maybe an auto-update feature I can activate? If so, where can I find it?

This question / problem has been solved by Zoidbergimage
That kind of thing is handled by the original launcher, so you have to launch those to update your games.