When viewing scan results, you can select a past date by clicking on the Calendar Icon, then the back arrow until you get to the month you want to search from.  Click on the date you wish to view & the appropriate stocks will populate the screen.

The date you are searching will be displayed in the header

Note:  Past Scans availability dates vary.   When a new scan is  added, the history is available from the day it was added to the platform going forward.