Parrot Bebop 2 - Manual (Page 72)

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With the vertical slider
1. Tap the waypoint.
2. Drag the slider on the right of your screen up or down to increase
or decrease the altitude.
With the context menu
The context menu allows you to control the altitude of the waypoint with precision.
1. Tap and hold the waypoint.
> A pop-up menu appears.
2. Tap EDIT .