Important Note: On your Resources page you will also see an option to Remove Item. Do not use this option as it will completely remove the item from your course and you will not be able to assign it in the future. If you have accidentally removed one or more items from your course, you can contact tech support to restore them.
You can unassign an activity from the Overview page or the Resources page. Click the three dots icon (...) to the right of the activity you want to unassign, then click Unassign Item.