@YouTube why is there no option to turn off Watch on TV? It’s so easy to accidentally press and such a pain to deal with when it’s connecting to a TV that your family is watching. Genuinely the part of the app that annoys me most.
While this option isn't currently available, you can take a look at our Help Center article on how to Sign out or remove an account from YouTube on TV which you may find useful: https://goo.gl/ECeptK . Hope this helps.