Tell MM to not use a part of a screen ?

[TokTias]

Hi all !

I’ve been using MM for quite many years now without any issues.
However, my old 4:3 montor used in my MM is dying and I need to replace it with something newer and brighter.
As can be seen in the attached image, the current monitor is covering the area marked with the orange box and the new monitor will cover the green box.
Is there some clever way to use CSS (or another way) to tell MM to not use the part of the new screen where the red box is ?
(And yes, the upper narrow rectangle glass is also prepared to be used with a screen.)

Cheers and TIA !
/Mathias