I run Zwift in a window and don’t lose any info from doing it that way… due to it being more letter box format you get more of a panoramic view from it 
I reduce it be a couple of inches from the top of the screen and place my minimised TR app here.
All my trainer road instructions etc appear in the middle of my display, I am running the latest release. All works very well for me.
Note that I haven’t tried it full screen with the App so can’t comment on that arrangement.