If you are done with an assignment and no longer want it cluttering your workspace, you can archive the assignment. Archiving the assignment will still give you access to it's assignment data, but it will not be in your class view.
Step 1: From your class view, select "archive" under assignment actions.
Step 2: Select the assignments you would like to archive, and then click next
Step 3: The following message will appear in a pop-up. After reading the message, click archive.
The selected assignments are now hidden from your class. When you select the manage dropdown menu, you will see the number of archived assignments.
Select "unarchive" from the assignment actions menu. Then select the assignments you would like to bring back, and click unarchive.