Canon MX720 Series Online Manual page 157

Printing begins.
Note
When you use a USB cable for printing, select "Canon XXX Printer" from Select Printer.
To cancel a print job in progress, use the Stop button on the printer or click Cancel Printing on
the printer status monitor. After printing is canceled, a sheet of paper may be ejected with no
printing results.
To display the printer status monitor, click "Canon XXX Printer (Copy X)" on the taskbar.
"X" is a device name or a digit. The number of digits may differ depending on the printer.