The preview window in OBS Studio on Fedora 33 is not working under Wayland. It doesn’t show anything. The issue apparently existed in flatpak as well but has been fixed. I don’t like flatpaks so I’d rather not use that. This suggestion does work:
env XDG_SESSION_TYPE=gtk obs
I plan to file a bug when I get a chance.
EDIT: Well that’s annoying, it’s part of RPM Fusion not Fedora. I guess I’ll need to create an account over there.