How do I terminate an app available through Apple Remote
How do I terminate an app I subscribed to using Apple TV
Apple TV 4K, tvOS 14
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Do you want to cancel a subscription?
How to cancel a subscription from Apple - Apple Support
Do you want to delete an app from the home screen?
Delete an app - Customize the Apple TV Home Screen - Apple Support
Note: deleting an app does not automatically cancel a subscription as well.
Do you want to force-quit an app?