Hi! With this being a public forum, you may need to ask your school tech support as they will know how things are set up at your school.
If they are old courses that still appear on your Dashboard, try clicking on Courses => All Courses and scroll down to see if the old course appears under "Past Enrollments." If it does, but it still appears on your Dashboard, you likely have an orange star appearing in front of the course name. This star is used to "favorite" the course -- so if you click the star and turn it "blank" (no longer orange/active) your course will no longer be favorited, and no longer will appear on the Dashboard.
If you clicked a link to Self-Enroll in a course, you should be able to remove yourself from the course. That button will appear on the course home page (on the right side of the screen.).
It could be other situations, so I highly recommend you reach out to your school's tech support.
I hope this helps!
