The Divi Theme Builder is an interface within Divi that allows you to use the Divi Builder to construct theme templates and assign those custom templates to pages or posts across your theme (including custom post types like Divi Projects and WooCommerce Products and Pages). With the Theme Builder, you have complete control over every single element of your website. And because you have the power to use or exclude templates on any page or post throughout your site, there is really no longer any need to manually edit a theme template file ever again.

Read full documentation: https://www.elegantthemes.com/documentation/divi/the-divi-theme-builder/