As with your Label Settings, the main thing that you need to decide about Packing Slip Settings is what size piece of paper you print them on.
If you chose a Label Setting that includes Packing Slips, then you don’t need to adjust anything. The Packing Slip combo will print on the same printer you selected for Labels. Likewise, if you don’t use Packing Slips at all, you can skip this step.
Keep in mind that the Default Shipping Confirmation contains all of the information that a Packing Slip does but, if you do choose to use them, getting started is as easy as selecting the Size and Orientation you need.