EHM The Blue Line

In the tactics screen I see the players positioning on the rink whenever I have "Show Positioning" checked. How do I edit it? Shouldn't I be able to edit where I want my players to go in certain situations?

My understanding is that it shows where your players are moving based on which tactics you are using. It would be a more indepth, checking your players attributes and style to select what type of breakout, neutral zone and offensive zone style you want. The show positioning will show what the players would do based on which tactic you have selected rather than allowing you to make your own style of breakout/offensive zone.