Check your printer setup. Your printing in landscape?

Non-useful suggestions.

Rotate your printer 90 degrees.

Turn your head sideways.

Instead of using 8 1/2 x 11 paper, use 11 x 8 1/2.

I thought those were useful suggestions.  I am bookmarking this page just in case I run into this issue so that I have some reliable suggestions to go by.

Same issue here.  Only the first page of the cover letter is generating in landscape format, the remaining pages are normal.  Frustrating.

Hi @Bundoran, 
Thanks for posting your question! Here’s a support article that may help with this:
How to configure Print Options in ProSeries Professional
If you need further assistance with this we would reach out to ProSeries Support, as they can best help with your specific situation.
Looking forward to seeing more of your contributions in the Community!