I think I can't but just confirming. I signed out of YouTube which should mean that whatever our guests watch (kids usually) won't mess up my own recommendations, but it's still recommending stuff on the main screen based on my Google account history. Nothing terrible but not really stuff for kids and it gets in the way.
So there's no way to clean this up without going full apps only mode?
Side note, I'm otherwise really enjoying the new Chromecast, but that might be because I was so used to swearing at my old Samsung TV's UI :)
I wish I could remove Disney+ recommendation. I'm not subscribed and I don't plan to.