In Picking Tab

In this tab, you will see all orders that are currently in picking and the pick progress of that picker

If an order is marked as complete without actually completing the pick, it cannot be assigned for Packing. If this happens, you have 2 options:

If you have the remaining item available, but on in any specific bin, you can force the order to Packing. By right clicking and open up the Force to packing screen. Select packer and the bin number then click save.
If you do not have the item, and will get them item scanned into specific bin soon, you are abe to send the order back for picking. From the Issue screen. You will want to fill the Default return bin location, so that the partially picked item is returned to a specific bin location and can be picked for future order picks.