If you're seeing the arrows, then you are using legacy mode, but there is no need to switch control methods. Some of my users prefer legacy mode, as it's a fast way to remove the blue control highlighting. I think about it like this: You push the trim wheels in the direction you want the aircraft to go. So, for the pitch trim, pushing the wheel forward/away from you pitches the nose down. Pushing the rudder trim wheel to the right yaws the nose to the right.