Can anyone tell me where I set the font size for the note name or interval that appears within the note shapes on the fretboard?

The reason I ask is it all looks good on my screen but when I export b3 looks like b8 with part of the 8 inside the b. In other words squished together. I have the diagrams sized pretty big, but I have a big monitor and bad eyesight. It's perfectly legible on screen, just non on the exported PDF.

Kind Regards,
Fleet