Hello Leo,
You will have unroll option if your subscrition for that selected course has passed the due date of completion, otherwise, you need to contact (if paid course)
Learner Help Centre = Payments & subscriptions ===Subscription ====cancel subscription in order to prevent any automatic payment deduction
If took course via financial aid, then wait until due date and then use the unrolled option from the 3 dots where currently it is showing you only rate and share.
Regards
DP