I can seem to change the font of the MDI window. I can change it in the screen editor but it doesn't save.

I have changed the GCode window font successfully without problem - but the MDI rmains a mystery.

thanks

I've done the same, won't change. My guess is that it is a native Windows control, being a multi-line editor. If native, Windows likely controls the font for it, hence any changes in the screen editor are simply ignored.