A sort of home made way to form a shieldwall/tighter unit:

Either in the deployment section before battle, or during the battle, if you have a legionary unit form a testudo and then have the unit stop forming a testudo, the unit will close ranks.
When you then move this unit, holding space bar shows in purple what area the unit should take up; after moving out of testudo formation, the unit never fills up all of this purple space.
The soldiers stand closer together.

I do not know if this affects positively or negatively the fighting ability of the unit.

Has anyone else noticed this, or tested it ?

Thanks.