I can’t get the expedite button to work on the Xbox version. How do i use it?
If it’s modelled, all you do is push it. If you push the button and it doesn’t do anything, it’s probably not modelled.
This is the FCOM blurb about Expedite:

You can always just do it manually, ie for descent select M0.80 / 340 for the speed and OPN DES, thrust will go to idle automatically. For the climb, set the speed to green dot.
I get it. I just saw some YouTube videos about it and it seems to work. Maybe he has FBW installed