Currently, in Account Settings > Display there is a setting to control which font the site uses.
However, offering a variety of fonts:
1. Has a negative impact on our first page load time
2. Creates issues as some fonts don’t work well with all the languages we support
Because of this, we will be removing the option to choose what font to use as part of our v4.0 release (July 16, 2017).
If you have feedback or concerns, please comment and let us know