I have this issue myself now and had to use the guest account workaround to get to my stuff. Something's wrong somewhere and resetting and uninstalling didn't work.
I am also experiencing this exact issue. No nav menu on the right, just Profile, Search and Home.
The same problem started today for me too. Like the earlier posts said, the menu is fully there on another account but on my main account, only search, home & settings show up
Hi Community Users!
Welcome to the Roku Community.
Thanks for bringing this to our attention. We'd love to provide further information about this and help you contact the right Support.
It seems like this could be a bug from the YouTube app. In this case, we highly recommend directly coordinating this with the channel provider as they develop and maintain their app on the Roku streaming platform independently.
You may reach them here for further assistance and clarification: YouTube Support | Contact Us
We hope this will be sorted out soon.
Best regards,
Carly