Problems with airplay

why when I connect my Mac book pro by a devise in airplay, I can see the tutorial on the external monitor, but I can’t use the software on the screen of my laptop.
When I open the Touch Designer the page of the software is all red…

any suggestion ??? is a normal bug of the last version of TD, I installed the last release…
or is a problem of my system operative, at the moment I run with OS X 10.15.7

thank you guys

see you soon