I’m on ps5 too. Basically for fly the interface lies. The best way to use it is fly to the edge of the circle it shows you, and then fly again. You can use it as many times as you like as long as you have movement left. I think fly is like 30 meters so with haste its 60 meters and that is basically the submarine to the rooms. The reason you have to fly to the edge of the targeting circle and then fly again is because there is a bug that doesn’t show you the true distance.