In the Publisher Set, you can create another set for the A4 printouts. For this you do not need to create new Layouts, you can just drag and drop them again from the Layout Book to the Publisher Sets.
Then you can specify A4 paper size and 70.71% magnification for that set. This way the A3 size drawings will fit the A4 paper.
Another way is if you print your set as an A3 PDF file, then in Adobe Acrobat you can print that A3 set resized to A4 size with a single click.
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