I can’t speak for fedora tho. Some search queries later the issues of other ppl sound similar to my issue.
Which problems do you actually have? For me there ain’t any restrictions.
I can install everything easily - for demos or similar software which can’t be added to your library instantly, you should enable Steam Play for everything.
You have to change this behaviour in your settings. In your case maybe via feddit.de/settings and change “Type” to “Subscribed”.