Sometimes you will need to cancel a Class as an Admin. If you want to have your Enrollees and/or Account Holders be able to cancel a Class, see this support article.
Here are the steps you need to take to successfully cancel a Class:
Step 1 - Move Enrollees
First of all, if your Class has current Enrollees in it, you will need to move them. How you do this will depend on the Enrollment Model your Program/Class is set up in. See this support article for detailed steps on moving Enrollees to the Unassigned List then re-enrolling them.
Step 2 - Change Capacity/Delete Class