I ran into a similar problem on Windows, I wanted to use the new font that I installed, the mononoki font. I could not find a change option, so I look at the source code of RStudio and find that for the desktop version of RStudio, RStudio automatically downloads fonts from the OS. It should work in the same way on the MAC.
All you have to do is:
1.Install your font as usual for your OS 2.Then restart RStudio 3.The new font appears in the Editor Fonts pull down menu (navigation: Global Options -->Appearance --> Editor Fonts) 4.Select the font from Editor Fonts pulldown menu.(Your Done!)
Here is the code that downloads fonts from RStudio. As you can see, it automatically loads proportional and fixed fonts. The web version of RStudio limits the selection of fonts to just a few fonts.
static class DesktopThemeFontLoader implements ThemeFontLoader { public native final String getProportionalFont() ; public native final String getFixedWidthFont() ; }
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