My IPad Pro is 4 years old. I have tried playing with the resolution settings in Duet and I can see a full screen but I can"t see the dock or any programs, I then switch it back to the original resolution and it goes back to the three quarters of the screen resolution. The developer of Duet says it"s letterboxing and they didn"t have any solution or work around to that. I"ll try playing with the resolution settings again and see if I can get lucky