Fujitsu ScanSnap S500 Operator's Manual page 62

For "Create facing pages in one image"
This mode is for scanning documents larger than A4 size, such as A3/B4/11" x 17."
Fold a document in two, scan in duplex and an image joined together is generated. (If a document
smaller than A4 printed on both sides is scanned, it is possible to output a two-page spread image.)
Operation
1. Right-click "ScanSnap Manager" icon on the taskbar, and select "Settings."
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2. On the [Paper Size] tab, click the "Carrier Sheet Settings" button.
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