You've been playing since 2013 right?... so you remember the old arrows, these work in the same way.
Is affecting individual player mentality, basically, for a more defensive, or attacking individual position. I always played since I started with 10 arrows, 2 blue in the DCs and 8 red ones (old colours, now red and green) with blue arrows in DCs basically they stay next to the own goal, and a DR with a attacking arrow -now green- is going to move from his position -visually at least- and try to push in attack.