Canon DR-2580C - Manual (Page 48)

44 Using the Scanner
2.
Select the Job Button (Button No.1, Button No.2, or Button No.3) whose
settings were changed with the scanner event.
3.
In the initial status, all the applications displaying [Send to this application] are
checked. Select one application to be started with the [Launcher] and uncheck
the checkboxes for the other applications and then click [Apply]. (See p. 40.)
IMPORTANT
You cannot use Job Functions if the [Disable device events] checkbox is
checked. Do not check this checkbox.