Google TV has introduced a completely new home screen experience. Parts of this new interface have reached older Android TVs, including home video and audio previews. If you do not like them, you can turn them off.
As the line between Google TV and Android TV is becoming more blurry, not everyone is happy with the way the home screen interface has changed. One thing that many people do not seem to like is the previews that play automatically. Fortunately, it is very easy to turn them off.
First, use the arrow buttons on your remote control to select the gear icon in the upper right corner of the home screen.
Scroll down to the Settings menu and select "Device Preferences".
Now scroll down and select "Home Screen".
The last thing you need to do is simply turn off both "Enable Video Previews" and "Enable Audio Previews".
See also: How to change Screen Saver on Android TV
The home screen will no longer play video or audio previews. AutoPlay previews can be really annoying, so it's nice that Android TV lets you turn off completely.
Source of information: howtogeek.com