If you no longer want to offer a course to customers and want it removed from your menu, you can delete it.

From the Courses section, click on the course you want to edit:
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At the bottom of the course details, click on the 'Delete' button:

Deleting a course will not affect your sales history for this course and it will not affect clients that have already purchased the course. If a client has remaining course sessions for this course and you delete the course, they will still be able to redeem the sessions they have paid for.