FlightDetent and CaptainMongo, Thank you for your inputs.
I can't believe I never noticed that the idle power was different in Managed Descent and Open Descent after so many years..
I could wait for my next flight but I'm too impatient so I will just ask: If we are in Managed descent and above the profile, let's say the speed target is 280kt but because we are high the speed will go on the upper side of the bracket: The idle thrust will still remain the same or it will drop to the same idle as ''Open Descent Idle''?
Thanks!