Archiving a shipment removes it from view on the "Shipments" board
There are two ways to archive shipments.
Shipment page
Select "Archive" on that shipment's page.
Company page
Select Manage -> Company to view your archiving settings.
Go to the "Auto-Archive Settings" in the bottom left portion of the screen.
You can manage which shipments get auto-archived and at what time.
The example below shows that any shipment that stays in the status' "Draft," "Quoting," or "Delivered" will be archived after five days
Once a shipment has been archived, you can view them on your shipment screen by clicking Include archived shipments in your filters.