The only way i've figured out so far is to export the document as a 2 page A3 pdf, then create an A4 artboard in Illustator, open the 2 page A3 pdf in Illustrator, fit it to the A4 artboard, export it as a pdf, do this for each page, and finally compile all the pdfs together in acrobat (and compress them, as each page has a gigantic file size)... surely there must be a simpler way?
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