Hi there,

Unfortunately, there's no way to delete progress within a specific course. This is intentional in order to prevent accidental progress loss.

If you'd like to restart a course, I suggest creating a new account or a child account to start fresh.

Additionally, you're always able to go back and re-do any of the content that you've already completed on your account, you just won't be able to mark it as not completed or reset your mastery progress.

I hope this helps! Please let me know if you have any additional questions!