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/
Have you tried casting your computer to the TV? With Win+K you can share everything and click around with your remote.
It’s what I do when I do it, but I don’t have any kind of device for that stuff.
I wish I could do this but I don’t have a Windows OS. I wish it had ChromeCast built in because fucking Pixel doesn’t even support MiraCast!