Adobe Community Help
If your PDF file contains different page sizes, like letter and legal, you can specify that the pages print on the correct paper size. The Choose Paper Source setting tells a printer to select the paper tray that best suits each page.
Choose File > Print.
From the Page Scaling pop-up menu, choose Fit to Printable Area.
Select the Choose Paper Source by PDF Page Size option.
Click OK to print.
(Reader X/Acrobat X) Click the Printer button at the bottom of the Print dialog box, and then click Yes when prompted.
Make sure that the Print dialog box is in the expanded mode by clicking Show Details in the Print pop-up menu.
From the Layout menu, choose Paper Handling.
Select the Scale to Fit Paper Size option.
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