I currently have an old LG LCD TV with their older firmware where it was possible to access "quick settings" when you move the Magic Remote at the bottom corner.
So you are able to use the remote even when the Source was HDMI and were able to change display/sound settings on the fly and see the direct new settings.

Is this possible with Android 9 as well?
I'm considering the Sony A8H (Android 9) as my next TV but if such a thing is not possible with Android TV I might eventually choose the LG CX because I know it's possible there.

I don't want to be forced change from HDMI to change settings in a fullscreen menu on my TV (I can't even remember when I wasn't on HDMI the last time and switching back afterwards)