A knowledge base article about How do I delete my bCourses site? provided by the UC Berkeley IT Service Hub - Knowledge Portal
Only bCourses Support staff are able to delete course sites. Please contact bcourseshelp@berkeley.edu and provide the name and URL of the course site that you would like deleted.
If you are simply trying to hide a course site from your dashboard, you can simply "un-favorite" a course. See more information in this Canvas Guide: How do I customize my Courses list as an instructor?