My laptop (MSI) touchpad drivers seem quite faulty. Some intentional hard tap events are blocked unless the touchpad is set to highest sensitivity, and when set so, constant phantom touches occur during typing. I cannot even see where the touch occurs, so the sensitivity is over the top. How can I block edges of the touchpad from being touched? I tried covering it with many materials, but the capacitance of my touch is detected through paper, leather, tape, plastic, nylon webbing, and nearly everything I tried. (I'm posting this question and answer as I finally found a convenient solution.)
Note: the driver is Synaptic, but the settings either do not work or cause undesirable side effects (like taps being blocked while I'm holding another key).