list_fonts() reports the font families that R can currently see,
which is what a theme's preferred fonts are matched against.
A font that is installed on the system but missing from this list is not
available to R yet;
see the Fonts section of theme_set for how to make it so.
See also
Other themes:
theme_colorblind,
theme_medium,
theme_set
Examples
head(list_fonts())
#> [1] "Academy Engraved LET" "Al Bayan" "Al Nile"
#> [4] "Al Tarikh" "American Typewriter" "Andale Mono"
