EDIT:
So according to this thread, this is a Google related change and not Nvidia?
In which case, similar to the banner issue from a previous update, you can get a different launcher (see comments for FLauncher) to avoid it
https://www.reddit.com/r/ShieldAndroidTV/comments/181vh4t/ads_at_full_screen/
Oh yeah, the UI in yours looks completely different. It’s way higher-end though than mine!
Mine is apparently “LG 65UQ80009LB”, for whatever it’s worth :D I could probably make it better by letting it go to standby but that’s not worth it for me. There is an option called “Home Auto Launch” but whether that’s on or off it boots to HDMI.
Anyway, it’s really not that big of a concern! Thank you for the replies though 😁