[2020-04-23: Please note this Leanpub Help Center article is being published in progress!]
If you have a Standard or Pro account on Leanpub, you can choose from amongst a range of fonts if you select the Custom theme option on your Book Theme page here:
...making sure to replace YOUR_BOOK with your book's unique address.
Below we will set our screenshots of examples of the various fonts. In each example we will show both a title font example and a body font example.
These fonts will be shown in the order they are shown when you click the menu to select a title or body font, and since that order is currently not alphabetical, neither is the order of examples here. Sorry about that! We intend to fix this.