I’ve got an Apple TV 4K connected to a Dell Monitor, so the ATV is running in 1920x1200 mode. However, I’m getting rendering issues, for example the spin down logo on the first screen and the world selection and events on the second screen. I’ve tried a reboot etc, the only thing left is to delete it and re-install it unless anyone has any other suggestions.
Zwift is very particular about the resolution being used, so see if you can force it into 1920x1080 somehow. Obviously this will introduce letterboxing on that display.
I used to run it in normal Full HD, but then I lose stuff off the sides and bottom as it’s a monitor not a TV. This was working ok but it seems to have corrupted somehow.