Speeding up and down

Speeding up and down option would be great for waypoint missions when filming snowboarders and downhill bikers in action. I have mavic air 2 and i cant get it work. Am i doing something wrong or is it possible to control speed somehow? Thanks for otherway very well working app!

Have a look at this topic:

I think Jucism was referring to the speed control option when flying waypoints with the Mavic Air 2.