Change Packing Slip orientation to Landscape

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Looking for some help in trying to change the default packing slips orientation to Landscape. I have tried to find a post on here along with general HTML coding but not been able to come up with any solutions that work.

A bit of context; Trying to make our packing slips once printed fold nicely into an A6 document wallet. Portrait (current format) does not allow me to do this. Any help would be extremely appreciated.