Fujitsu ScanSnap Advanced Operation Manual page 147

If the split line is not aligned with the gutter of the book, drag the corner points to correct the
position.
4.
Click the [Apply] button.
a A message for confirming the split target appears.
5.
Click the [Selected Pages] button.
a The page is split.
When you have completed splitting the page, click the [Save and Exit]/[Save and Quit]
button.
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Scanning Books