Since uipress v2.2, setting a custom font for the admin area can be done from the uipress styles page (settings > uipress styles)

Once here you will see the custom font option under the global tab.

We don't currently support uploading of custom fonts but you can override the uipress font with the following css:

html{
--uip-body-font-family: Arial;
}

Did this answer your question?