This actually kinda sucks on Linux. Shit started blinking out of nowhere and wouldn't respect the chosen scaling options. I added a launch parameter to the .desktop file and that fixed it but it's so hacky and people have been reporting the problem on the beta github for months with no fixes. Also Adwaita For Steam skin is broken now and it doesn't look like the rest of my desktop anymore. That one's minor but still.
Well, I am glad it works for you (not being sarcastic). Everything was just fine on my PC and now it's not though, and like I said I'm not the only one if you look on github. The 4k monitor scaling has been broken for a very long time.
Steam Update Makes Big Changes to the User Interface (gamerant.com)
They're actually really nice!