You will find the custom tabs’ settings in your WordPress admin area navigating to the LearnDash LMS menu ➡ Custom Tabs
1- Add a section title and other tabs
2- Manage the tabs here with their icons and titles
3- Add tab’s content and update it
4- You can view the custom tabs in the frontend user interface
Note: The same pattern of setting will be followed for lessons, topics as well as quizzes tabs.