Completely change home screen on Android TV

I have Android TV (Sony KJ-65X8500D running on Android 5.1.1 Marshmallow if relevant). On the home screen, there are several ads and a wallpaper that I don't control. It's currently showing an ad for a TV show I find highly offensive and I want it off my TV. It's not just an icon. Since it's the default icon (the first one), it also defines the background of everything on the home screen. How do I change it to 1. Get rid of the ads 2. Set the background to my own photos