Android TV is all about media, and there are several ways to mix browsing and watching to optimize your viewing experience as much as possible. Picture-in-picture puts a video in a corner of the screen and lets another activity run behind it, a sort of multiwindow for TVs. Some video apps will continue to play in the background even when the launcher is opened. The largely transparent launcher makes it easy to browse other content and switch when you’re ready.
This can be a bit frustrating for users, who are used to apps being closed when they want. Since Live Channels continued to play, they didn’t know if they were doing something wrong or if there was a way to turn off the stream. Video can be expensive to broadcast, and that could increase Internet usage even when not being watched. It may also take up more of your precious bandwidth even when not in-use. A workaround has been to open another app, causing Live Channels to disappear, but it always seemed like a poor workaround.
With the latest version of the app, 1.12, it is now possible to close the app manually. From the homescreen, you can tap back twice. This closes the launcher, returning you to the app, and then closes the app. If you liked having this background stream, you can still use the Home button to overlay the launcher on top, and pressing back once will return you to the stream.
Your TV should already have gotten the update, but you can also get it through APK Mirror.