When you enter Files tool, you will see that each of your submission folders has an ellipsis in their row. When you rollover on the ellipsis, you will see several options:
To make changes such as folder’s opening date, closing date, and permission, choose Folder Settings.
To edit a Turnitin submission folder's settings, use the former method - rollover the ellipsis of the submission folder, then click the cog icon (folder settings).
If you need to apply actions on multiple folders, roll over on the folder and place a tick on their check box. These folders will be selected and the actions (Delete, Move to, Copy to) that can applied on them simultaneously will appear on the right-hand side option.
* You cannot move a folder into a submission folder.