If you are annoyed by the accidental touch on the MacBook (Pro) Touchpad and want to turn it off here is what you can do:
Create 2 launchers on your desktop which when double clicked turns the Trackpad ON or OFF.
Here are the commands:
First you need to make sure the following package is installed:

apt-get install xserver-xorg-input-synaptics-hwe-18.4

Launchers on the desktop can be created with the right-click menu o the desktop.
Commands in the launchers:
Turn it ON: synclient TouchpadOff=0
Turn it OFF: synclient TouchpadOff=1