Because of Registration's student record retention requirements, faculty are not able to remove students.  If you have a student who has withdrawn, that student can be suspended to block their access to the course, then an email should be sent to cotronline@cotr.bc.ca asking that the withdrawn student be removed.

If you have a student who withdraws late in the semester after submitting to assignments, you may want to leave them suspended, so their submissions are backed up when the course is backed up.  If this happens, then you will have access to the submission in the future if needed.