It adjusts the toe of front wheels and it's called DAS (Dual Axis Steering). This is only currently being used by Mercedes in F1. In simplest of terms and from

It adjusts the toe of front wheels and it's called DAS (Dual Axis Steering). This is only currently being used by Mercedes in F1. In simplest of terms and from what I have understood, it can reduce friction and tyre wear on long stretches by having 0 toe (parallel front wheels). And achieve better grip on corners by moving the front wheel outwards. This is a nice video explaining all this: https://youtu.be/TxKhi6Qsrog?t=67 https://youtu.be/TxKhi6Qsrog?t=67