Two relevant topics:
Release it was included in:
https://zero-k.info/Forum/Thread/35048?postID=248839#248839Original widget creation:
https://zero-k.info/Forum/Thread/34689?postID=248321#248321In short if you activate it and set ranks the line-walk is spaced perpendicular on the rank.
So:
11111111111
22222222222
33333333333
44444444444
Allowing you to move in formation. So you put riots in front and artillery a line behind that.
Not sure if this is all correct as I don't use it.
You set the rank of the unit where the other states are (move/stand-ground/hold fire/etc).