I've followed up with you via private message to gather a few more details. Please feel free to take a look and reply when you have a chance. I also have a couple more questions to add:
- If you wouldn't mind, please also let us know what steps are required in order for you to restore the full screen display. Does exiting the channel restore the full screen display, or do you restart your device, etc.?
- Have you tried multiple HDMI ports on your TV?
Please let me know if you have any other questions!