To customize font display in your graphical session, you can use configurations provided in /usr/share/fontconfig/conf.avail/. To do so, create a symlink to the relevant .conf file in /etc/fonts/conf.d/, then use xbps-reconfigure(1) to reconfigure the fontconfig package.

For example, to disable use of bitmap fonts:

# ln -s /usr/share/fontconfig/conf.avail/70-no-bitmaps.conf /etc/fonts/conf.d/
# xbps-reconfigure -f fontconfig

Use fc-conflist(1) to list which configurations are in effect.