Updating the Status of a PO
Drag the PO in the KanBan board
Drag POs to the appropriate column so you can manage the status of the PO appropriately. After you move over to received, the PO will no longer be in draft.
Update the status from within a PO
In the PO, you will see a dropdown status next to the supplier name. You can click this and move it into Ordered or Received.