Ground battle changes 3 years ago

The ground battles used to be quite large and took up the entire z axis or depth off the battlefield however in the current version of the game they shrunk this and I don't know why, no matter how large my or my opponents forces they only take up a small portion of the lower half of the field, I've been trying to mod this myself and have had no luck with ground formations xml's or simulation descriptors, if anyone knows how I can make infantry and the like use the whole field I would really appreciate it.