iPad Pro not screen mirroring/airplaying properly on TV

I have the newest iPad where I use my Smart TV to screen mirror/airplay my screen for other to see the work I’m doing. Other apps are functioning as expected, however Vectornator is not. When I open the app while screen mirroring, the TV only shows the screen with all of the files/artwork saved on vectornator and the iPad functions as usual. It would be great to have vectornator screen mirroring as expected (view what the iPad user is seeing on other devices such as a TV)