I'm going to have an elderly person living with me soon. Their caretaker has already let me know that they WILL try to watch certain "fringe" propaganda channels if they have the opportunity, and if they are allowed to watch them they'll get extremely agitated...
With that in mind, how do I block channels from appearing in the Roku store?
You can't. However, you can add a PIN to your account and those channels cannot be installed if you don't know the PIN. So while they can see the channel in the Channel Store, they can't install and use the channel.