For Synaptics Touchpads, double-tap the top-left corner to disable and enable. Or, open Settings and search for touchpad. Toggle it on to unlock the touchpad. Alternatively, enable the touchpad in ...

How to disable the touchpad in Windows 10 through the keyboard Some Windows 10 keyboards have shortcuts that allow you to disable and enable the touchpad at will.

Ubuntu: If you're running Ubuntu on a laptop, and you want to disable the touchpad when you have it connected to an external keyboard or mouse, Touchpad-Indicator is a menubar applet that can help ...