Set the way the pulse width is changed by click & drag.
IF THIS OPTION IS ENABLED (DEFAULT AT STARTUP):
Click on the desired time slot or right-click on the pulse (anywhere in the pulse area) and drag its right boundary to the desired position. Dragging past the right edge of the display will auto scroll. Dragging the pulse width to zero will set it to 2 units, which is the minimum.
IF THIS OPTION IS DISABLED:
Use shift–click