Same here, can we get the previous UI or at least remove the border from page content? Try to use youtube in dark mode with opera light mode, it's just terrible.
Also there favicon of pinned tab is missing when music is playing
The bit which needs fixing is the button I clicked to set it up, which I saw on the "see your transactions" page from an email stating I've had some cashback approved - I then clicked something to join my wallet and it failed to enable it. Somehow following leocg's instructions it got enabled ok.
Glad to hear that following leocg's instructions helped you successfully enable the button. If you run into more problems or need additional help, feel free to ask.