Learning to track and catch fly balls in the outfield takes a lot of repetition. The drill linked below allows Coaches to get multiple reps with up to 6 players done in a short amount of time. You should be able to get 10 reps with all 6 players in about 10-15 minutes.
The key here is watching the player’s first step. If going back (straight or angled) the player should drop step. If going to the left or right cones, a crossover should be utilized. Hops, or turning the wrong way should be corrected.
This drill can be done inside or outside, as well as part of your pre-game routine for outfielders.