To Archive a Session, go to the Sessions menu, find the session you want to archive, click on the ellipsis to bring up the sub menu, and select Archive
To Unarchive a Session, go to the sessions menu, then select on the top column called Show Archived then look for the session you want to unarchive, click on the ellipsis to bring up the sub menu, and click on Unarchive 
Here is a video of the release that explains how to archive and unarchive a Session
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