My mistake about posting in the mobile setting. As for the "forced" I meant to say I don't have the choice to change Google in the Windows' Opera. If there is, I've not managed to figure it out.

Actually, the PC browser, for Windows 10 specifically. I've tried all Android versions and they all allow search engine default changes.

What's the point of Opera's privacy when I'm still forced to use Google as default search engine? Basically having to make sure I switch all my privacy setting in Google so I can have some sort of privacy and if I'm lucky Google won't change them when it does some sort of update.