Leanpub is a self-publishing platform, and most Leanpub authors use on of our own book generation "writing modes" to write and publish their books.
When authors use one of our own book generation writing modes, you should be able to use all the normal Kindle features, when you add your Leanpub purchases to your Kindle.
However, some authors prefer using their own apps to write and produce ebooks. So, for them, we have an "Upload" writing mode.
Unfortunately, sometimes authors upload ebook files that are not compatible with all Kindle features, like adjusting the font size, sorry about that.
For more information on this topic, please see this article.
If you have any feedback or questions about this article, please email the Leanpub team about it at email@example.com!
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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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