@Tracy Mason
You can archive items from workflow in the the Explorer grid by right clicking on an item, selecting Workflow, and then selecting Archive. You can also do this by selecting Workflow in the menu and then Archive. This will retain the workflow history and the item will no longer be in workflow.
You can also configure the queue to archive automatically by opening the queue properties, selecting Removal, set removal method to archive, and then set when to apply that action. If you leave Days, Hours, and Minutes as 0 then will happen immediately unless there are a lot of items in the queue already. If there is a large volume then it will take some time for Workflow Agent to process them all.
I do not know a way you can hide queues but you can remove the users and groups from the queue so it is not visible to non-manager users. You can also remove queues from workflow once they no longer have items. The deleted queue names should still show in workflow history for any items that entered those queues.
Hope this helps.
