On your main DEALS screen, you may choose to view ACTIVE Deals: deals in active sales stages: Qualifying, Negotiation, Trial Shipment, Final Negotiation.
Or you may view INACTIVE DEALS: WON, LOST or STALLED Deals.
You may also go to REPORTS and run a Report for WON, LOST or STALLED Deals.
Here now, a short video overview of Active vs. Inactive Deals: