aniiran wrote on Nov 11^th, 2023 at 6:35am:

I have learned that if you change the speed you have to hit the down arrow on the speed knob to get the speed to change to what you entered.  I don't think it's supposed to work this way in the real world.  Same with the heading if you dial a heading you have to click down on the knob to get the airplane to respond.

In the real world we use push (right-click) and pull (middle-click).
Push will set and hold the current value, e.g. heading.
Pull will activate the selected mode and the autopilot will follow previously selected value, e.g. heading.
The same goes for SPD and ALT.