There is a "Custom" theme option available for book Themes, with lots of configurable settings that will be applied to your whole book.

You can learn more about Leanpub book Themes here:

What are the settings for each of the different Leanpub Book Themes?

We added a lot of settings around parts, chapter, and sections, and not all the article in the Help Center may reflect this!

For a summary of these settings and some screenshots, please see this article in our Authors Forum:

More configuration options for numbering in Custom Themes

If you have any feedback or questions about this article, please email the Leanpub team about it at hello@leanpub.com!

If you have any questions or thoughts on writing and self-publishing with Leanpub, please join our global community of authors in our Authors Forum here!

Are you interested in self-publishing, and creating your first Leanpub book? Here are some quick tutorials for our most popular writing modes: http://help.leanpub.com/en/articles/3088382-quick-walkthroughs-for-getting-started-on-a-leanpub-book

Are you looking for great deals on Leanpub ebooks, ebook bundles, and courses? Sign up for our Weekly and Monthly newsletter sales here!

Subscribe to our YouTube channel here: https://www.youtube.com/leanpub

Please subscribe to our YouTube channel here: https://www.youtube.com/leanpub

You can also follow Leanpub in lots of other places!