Reference materials are a way to enter and view a list of terms, characters, etc that appear within your novel.
If you'd like to refer to the terms, it can be accessed via the reference materials tab on the series details page.
If you select a term from the reference materials page, you can open that term's details.
If you'd like to learn more about adding categories and terms to your reference materials, please refer to this article.
If you'd like to enable term conversion for your reference materials, please refer to this article.