To get started first you need to navigate to the Divi theme options.
Divi → Theme Options → Builder
There you will find the option to enable Divi compatibility for “Courses”. Enable the post type by turning on the toggle buttons.
You should now be able to select edit with Divi builder and customize the existing contents using the Divi editor.
Import the Template JSON file from the Plugin
Currently, if you are editing an existing single course page using the Divi builder you will find some missing elements. To properly edit the existing contents, you need to import the JSON file “single-course-sample.json” using the import option found in the Divi editor.
wp-content → plugins → tutor-lms-divi-modules → pre-built-templates
There you will find
Choose the layout you want and start building your course page with the available Tutor LMS Divi modules.