When I try to AirPlay to my Sony TV (built in AppleTV), these are the only screens that show on my TV and iPhone 12 Pro Max. The same applies if I mirror my phone and click full screen. Video will show in small window until I click full screen on my phone ...
Sony rolls out AirPlay 2, HomeKit & Dolby Atmos as part of Android 9 update - FlatpanelsHD