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:
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:
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
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