Try disabling hardware acceleration in the settings.
Also check whether Opera GX is using your GPU instead of your integrated graphics processor or not, if it is, then switch it to your integrated graphics.
I've figured out what is goin on. Looks like some locations do not support the "games only" tab. There's now a bug when you select "games" only, if your location doesn't have any news for games, the whole thing disappears and you can't revert back to "All". The solution is to add another location together with yours, the daily news feed will come back.
@leocg Solved!
Resetting the browser settings made the "Enable chromecast support" appear again on the configurations and now it shows either the cast option on YouTube videos as on the dropdown menu when right clicking with the mouse in any tab.
Thanks a lot for this beautiful help, comrade!
Have a nice day!
@leocg I just had that same problem. IDK if its the same option you said since my Opera Gx is in spanish, but i disabled the third-party cookies blocker and enabled it back again and now i can copy paste things in google docs