After adding a mini monitor (1366 x 768) below my main one (1920 x 1080) I finally managed to export MFD screens for my usual planes and helos.
but the control indicator windows were sent to the mini monitor and clipped... instead of staying in the main window as they were before:
I found a post in the forums and did some experiments, relocating to the main view
planes are: F/A-18C, F-15SE, A4E-C, and helicopters OH-58D and AH-64D