First of all, I would like to thank Jeff, Jan and Andrew for the advice and tips.
I have used many attempts until each monitor is individually adjustable.
Yes, that could be a solution to my problem.
But there are also disadvantages and bugs in this screen display.
My first conclusion:
1. For the best screen each aircraft needs its own main.mcf.
2. The mouse cursor is not visible.
3. Some EFIS screens go dark when panning the panel up / down.
For the settings there is the field_of_view_factor in main.mcf .
That's the best way to change the distance to the panel. This factor does not exist in the normal main.cfg. Why not?