Hi @oh_95  thanks for connecting here. I believe this is your concern? 

How to delete a course

How do I delete the dashboard for a course I've enrolled in?

You control the courses on your Dashboard by managing your main Courses list. Any course you remove from the Courses list drop-down will no longer appear on your Dashboard.  

Please check out How do I customize my Courses list?

I hope that helps, let me know if you've got additional questions, thank you.