Nikon Scan User Manual page 22

When the original image is flipped horizontally or vertically, the
corresponding Flip button appears to have been pressed, and
will remain in a depressed position, as shown below. Clicking
the button again restores its original appearance.
Zoom
When the Zoom-in button is clicked, the crop area fills
the entire Preview area. After a zoom-in operation,
the original display is restored by clicking the Zoom-
out button.
If Zoom-in or Zoom-out functions are unavailable (e.g. when
the minimum or maximum image size is shown), the
appropriate button is dimmed (inactive) and cannot be clicked.
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