Gemini Air - using apps

When we try to view shows through apps, Peacock, Disney+, Hulu, etc says something went wrong. When we cast Peacock or Hulu to TV (which is the only way we can get them to even work) the picture is only in the top left corner.  Any way to make the picture full screen?  The only app that functions properly is Max.

I have un-installed these apps and reinstalled with updates, but problems remain.

Thanks for any advice!