Go to Teaching on the left and click on Courses. Click on the specific course.
Go to the Users & Groups tab. Go to the specific user and click on details.
Change the course items to Viewed or Not viewed to alter their progress. You can also change their overall Course Status or Clear Course History, clearing all of their module statuses and reverting them back to Not Started.
Using the Not Applicable status will remove the course from a user's enrolled courses without requiring a pass or fail. This is useful for unenrolling users who were enrolled via a Group.
Click Update when you're finished.