Admin can easily manage the multiple layouts for the single course page from the backend as the Reign LearnDash add-on provides you to set different layouts for the single course page.
Go to Dashboard >Reign Settings >LearnDash > General; here, you can see the “
Suppose you want to set the layout for any individual courses. Then go to Dashboard >LearnDash LMS > Courses.
Select any course and click on edit. Now you can set the course layout from here, and don’t forget to click on the update button.