Under Options > Gameplay > Formation control, one can set orders to unit to not override current formation. With the current workings of formations, this can lead to a non-negligible efficiency gain for orders like gather, build, capture... This because units will waste far less time bumping into each others while in the same formation. I'm posting this because I have for a long time, I not understood it was a setting when witnessing players using it, thinking it was marginal usage of