Based on my (Citroen) in car touch screen
They are all SHIT.
A little trick mine plays (for example when selecting a preset speed for the limiter) is to "blip" to show it's registered your touch, and then do fuck all - the wife has actually filmed this happening.
The result is you either end up speeding, or looking for longer than is safe at this utterly shit piece of kit that you have to somehow tell yourself made it through the most exacting of tests to be allowed out in the wild.
I know it's a car, not a 737Max, but the former explains the latter.