Do more on the web, with a fast and secure browser!
Download Opera browser with:
Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
I found real solution for
https://forums.opera.com/topic/41971/solved-youtube-now-opening-full-version-of-website-in-browser-not-mobile-version-of-youtube/2
That not need reinstalling the app.
You just need to switch it inside the YouTube itself. Just tap your profile icon and find Mobile version option. (And at the same time keep desktop version switched off in the opera)
leocg