I think i misread this when I woke up. You have to click the fly action first (you get this action from illithid powers, grant flight spell, or potion of flying), then click to where you want to move. Don’t click outside the giant circle or youll start walking first and that will use up some movement of flight. You can see how much movement you have left by looking at the bottom of your screen and that little yellow line is the amount of movement you have left relative to your maximum movement. Also if you have everyone use the astral touched tadpole they will get flight for free so you can have your whole squad flying if you pass a few persuasion/intimidation checks.