Canon Pixma MG3550 Online Manual page 18

The second item is scanned and appears in 2.
Note
Click Cancel to cancel the scan.
10. Adjust the scanned images as required.
Use the Toolbar to rotate or zoom in/out, or drag the images to adjust their positions.
Note
Select the Adjust cropping frames checkbox to specify the area to be saved.
Adjusting Cropping Frames in the Image Stitch Window
To scan an item again, select the image in the Preview area or the thumbnail at
the top of the screen, then click
allowing you to scan the item again.
11. Click Save.
(Delete). The selected image is deleted,
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