Do disable Favs and All games from appearing from main view press start/Game Collection Settings/Automatic Game Collections and untick All games and Favorites.
And any others there you may not want if showing,or add any by ticking boxes.
For screenshots,do you use that function? Dont think so since you dont want it shown right? Then simply dont take screenshots and the system wont appear.
If you have screenshots there already but dont want them simply delete them.Update gameslists or reboot and it will be gone.
If you take a screenshot accidentally it will show again.so you must do this again. As for permanently disabling it even if you have screenshots there I dont know.