@sgunhouse Yes I did a single-user install. But the problem solved itself after I checked a few older forum posts about similar stuff with the normal Opera 52 I think. I read about some Software to clean your PC n stuff and tried that. After a restart from my PC I could just pick it as a default browser. Sorry, should've tried that before going to bed yesterday but I was too lazy.

Hey! I just installed Opera GX today because a friend of mine recommended it and for some reason I can't make it my default browser can someone help me here? (https://prnt.sc/wb32dj just to make it clear "App auswählen" is german and means something like "Choose app" just for those that might not understand german)