Hi graemeb,
Thank you for your post and welcome to the Community Forum.
When you click on Print, the document downloads as PDF, upon clicking Print on the PDF document again, you should be presented with a Printer Preferences screen where the paper size can be changed.
The window settings can override the normal printer settings for the document being printed; we recommend checking if that is already set to the correct paper size. The reason the right-hand side of the page is clipped off is because of the Page Set up settings. It will set a wide margin. If you specify your printer, you will get the correct margins for that printer. If you are scripting the print/save, then before the print step, include page setup and specify the printer you intend to use.
Let us know if you need further assistance with this. We are happy to assist you.
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Regards,
Cel