Your Apple TV streams video and music, but it stores apps locally. The more apps you download to Apple TV, the more storage is used up. At some point you may get a warning that you’re running out of disk space. If so, you can remove apps to free up space.
You can set Apple TV to remove unused apps to save space. Removing apps preserves your documents and data in case you download an app again later.
Open Settings Find apps in the Apple TV App Store.
Open Settings on Apple TV.
Go to General > Manage Storage.
A list of the apps on your Apple TV shows how much space each item is using.