That Android mirroring change is new and working as expected. They added
that so you could limit sharing to just ONE app and not accidentally
share something private from another app. Video streaming in Chrome
depends on how you are streaming. If you...
As Chris pointed out, you can only connect Bluetooth devices. Speaker
Groups only work for audio-only sources (like Spotify and YouTubeMusic).
They are not available for video sources (like YouTube, Netflix, etc).
Unfortunately, that sounds like something the maker of that app has to
address. I would suggest you reach out to their Support. Everything else
you did proves that the Chromecast device is working correctly and the
fact that other apps work points to...
You cannot remove a device from the Cast list. That list is dynamic and
always shows you every device that is currently available and ready to
receive a cast. The only way around that is to either turn off the
device or put it on a different network....
