Click on the Configure dialog box's Argument button to open the Argument window.
Click on the large button at the top of an argument form so it is on:
. (The button looks like this when it is
off: 
.) This selects the argument.
Caution: More than one argument can be selected at once. All selected arguments will be deleted when the Delete button is clicked on.
Click on the Delete button, which deletes all selected arguments.