Hiding a channel will not remove it from within the app of the service that is providing the channel.
Hiding a channel will remove it from the Fire TV’s Channel Guide, will prevent it from showing up in the Fire TV’s Live tab, and will not allow it to appear in the “On Now” row on the Fire TV’s home screen. Here’s a guide on how to customize your channel list.
The good news is that it’s very easy to hide the channels you don’t watch, but the option is a bit buried. Now that the list of services and apps integrated into the Fire TV’s Live Experience has grown even larger with the addition of Sling TV, Hulu, and YouTube TV, your Live Tab and Channel Guide might be getting cluttered with unwanted channels that you never watch.
