While the "Scan to View" barcode is the fastest way to bring up order information using a barcode scanner, it won't help if it isn't a good fit for your workflow, or if you don't have a barcode scanner!
It's easy to turn this barcode on or off for your default packing slips.
Head to your Account Settings (the wrench icon in the upper right).
Next, select Printing and then Printing Setup from the sidebar on the left.
From there, find the row for "Packing Slips" and click its Document Options link.
Finally, make sure you've removed the checkmark from the appropriate box to disable "Scan to View."
Don't forget to Save Changes! Once you've completed that step, "Scan to View" barcodes should no longer appear on your packing slips.