I found a way to make an appropriate permanent xrandr configuration. This topic can be closed.

Hello,

I'm using GhostBSD 24.07.3 with the MATE desktop, the monitor configuration only allows 100% and 200% magnification.
I tried to use xrandr to have 1.5 and 1.75 magnification, but I couldn't make that permanent.
Maybe it is a feature for future releases.

Greetings from BigR