Inside config.xml, if you try to set TerminalFontDefaultSize to 24 (which, on my high DPI monitor, is about the equivalent of 12 on a typical monitor), it keeps changing it down to 20, which is just a bit short of being comfortable to read.

kOS in general is difficult to use on this monitor due to it ignoring KSP's UI scale setting, but that's another issue... I can script around it for my own UI screens, but I scale them based on Config:defaultFontSize, which is being clamped as noted above. :( Fixing this would at least keep my own scripts' windows readable.