I found two places where you can change the font, first in File -> Settings and in the text box.
I can select any installed font. I set the standard font to Roboto which is one of the seldom fonts available for most systems like Linux and derivates, Android, macOS.

I'm in SH3D ver. 7.5 in Windows 11
There is no "settings" maybe "preferences" where there is a default font setting box but "roboto" as well as the newly installed fonts are not there.

I don't even need it to be 3D, only displaying it on the 2D screen, I'm literally "writing on the road" things like "STOP" and "MPH 20" and "FIRE LANE"