Use proton.
BG3 was not released to Linux. It just available to steam os by using proton. Mybe you can try wine as well.
But with proton it's working flawlessly.
Graphical problems performance issue bugs are other things.
There are some really good guides how to do it. On redit and Linux or steamdb forums.
I did it to at the beginning when it was not so supportive in early access. I don't say I am a grandmother but more like a casual user. I like to play games and not install them. So for sure you can do it hopefully.
Last edited by ZOZO1006; 12/10/23 10:16 AM.