It’s fairly obvious how to quit an app in iOS. But tvOS uses a slightly different technique because there’s no on-screen touch interface—as with, for example, the iPhone.
A typical scenario is having a misbehaved tvOS app lock up after you hit the Menu button to exit back to the tvOS home page. You may see a spinning gear. Or nothing at all.
Apple recommends that you check to see if you have the latest version of tvOS.
Force Quit a tvOS App
Here’s how to force quit an app.
1. Double press the TV/Home button. (That’s the one with the TV icon to the right of the Menu button.)
2. Swipe right or left on the Siri remote’s touch area to bring the desired app icon to the foreground.
3. Swipe (flick) towards the top of the remote’s touch area, similar to what you do in iOS, until the app icon disappears off the top of the display. This quits the app.
If the app continues to misbehave, you may need to delete the app, then reinstall it. See Apple’s tech note # HT201398. It includes a mention of some apps that need sign-in information to reactivate.