On the left-hand side, select Mouse and touchpad. Scroll to the bottom and ... Eg. In the case of Lenovo laptops, the last option would be Thinkpad. On a Dell laptop, it could be Dell Touchpad ...
the little red nub found on the keyboard of nearly every Lenovo (and at one time IBM) ThinkPad laptop. That little red orb controlled the mouse cursor as an alternative to the touchpad ...