When you customize a blog post format with Gutenberg, please note that you won’t be able to style these blog post formats with Divi or assign a Theme Builder template to them. To customize blog post formats within Gutenberg you’ll need to have purchased a child theme that comes with styled post formats, create your own, or style them with custom CSS in Divi’s general settings.
In this doc, we’ll go over the 6 post format types that Divi supports and how to use them.