I agree. This simple thing.  We like the address on the top right side when we fold our packing slip, it shows the "Ship To" address along with a PO field.  Most of our customers will not accept a package without a PO that can not be easily visible.  With the current layout, if you fold 2 times, you will only see the Bill To and  Ship To. but the PO is on the other side.  With the ability to edit the Packing Slip, we could move things around to have important information to show in a packing envelope.