如果您想改变您文档的页面大小(举个例子，打印 US 信封大小的 PDF 到 A4 大小的纸张上)，您可以为该文档改变打印格式。
Open the menu at the top-right of the window, then select Print….
Select the Page Handling tab.
Choose a Paper Scaling from the drop-down list.
None: do not perform page scaling.
Shrink to Printable Area: document pages larger than the printable area are reduced to fit the printable area of the printer page.
Fit to Printable Area: document pages are enlarged or reduced as required to fit the printable area of the printer page.
Click Print to print your document.
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