Hi Dimitar, that is really good input, thank you for that!
I have the following problem:
I run both a Galaxy S8+ (Android 9) and a Galaxy S10+ (Android 10) on an acer 4K 27"" Monitor with Samsung Der - so USB-c to HDM cable.
When I connect the S8+ with Android 9, Zwift runs fine in fullscreen (of course graphics lack of quality, like you described).
When I connect my Galaxy 10+ however to the same monitor with the same cable, in fullscreen mode ZWIFT is stretched in a very ugly way. I tried other 2 Monitors with both mobiles with the same result. Even when I first start Zwift on my S10+ and than connect to DeX, it gets a bit better but not like on my S8+. So I presume it could be the Android Version 10 on my Galaxy S10+ causing the problem.
Do you have experienced the same , and do you have any suggestion how to solve the problem? Thanks a lot for your Help!