I have a three monitor setup; I want to add a fourth display that is a behind the screen projection. The projection unit "pocket projector", does not many option for it; so I can not reverse the screen image from the unit. Is it possible to do so in KDE, and if so, how?


Thank you in advance for any help you can give me.


Using
Fedora 26, Plasma 5.10.5, Framework 5.40, Qt 5.9.2 &
KDE Neon, Plasma 5.11.4, Framework 5.41, Qt 5.9.3