That actually worked for me! Thanks so much! Now I just have to go fix all my other file associations back since microsoft retook over all my media files -.-

downloaded and installed chrome, tried your fix again, still doesn't work. uninstalling chrome (and possibly opera if this keeps up, so bloody annoying)

oh, thats what is causing my fullscreen to occasionally spaz out. I have dual monitors that are different sizes (one is 4x larger than the other) but operate at the same native resolution, using different dpi setting for each. not using DPI kinda makes everything else on my computer unusable on half my screen space which isn't really much of an option.

I don't have chrome but I tried those same steps using both Microsoft Edge, and firefox, no dice. despite disabling the default browser check opera STILL brings up the settings window constantly.

That "fix" does not work, the problem still persists.

I'm using opera as a new user, the same thing is happening to me.

every time I open Opera, the Windows 10 System Settings window also opens displaying the Default Apps tab.

extremely annoying behavior.