When it comes to uncoupling the unit, I can't select any of the items on screen, it just says "driver mode only", and consequently I can't complete the scenario.
I have had similar issues when using any TMS screen and found switching the setting to turn the screen enhancement off (can't quite recall it's exact name) and just zooming in like in TSW4 helps and works as expected
I remember #1 Switching to classic controls >> #2 Changing the view the screen >> #3 Switched back from classic controls and then zoomed in.