Canon MX720 series Online Manual page 15

9. Click Start Scanning Image 2.
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 (IJ Scan Utility)