Canon MX720 series Online Manual page 164

If your scanner or printer does not appear, check the following, click OK to close the screen, then
reopen it and try selecting again.
MP Drivers is installed
Network settings of your scanner or printer is completed after installing the MP Drivers
Network communication between your scanner or printer and computer is enabled
If your scanner or printer still does not appear, see "Problems with Network Communication" for your
model from Home of the Online Manual.
You do not need to use this software when scanning via USB. See
Selector EX" to delete it. You can scan via USB even if it is not deleted.
"Uninstalling IJ Network Scanner