I've recently had the front tracking done on my 2015 RRS.

Showed green on the alignment computer screen in the garage, so that's good.

Before the session, the steering wheel was slightly turned to the right, when going straight on.
Since having the alignment done, the steering wheel is at even more of an angle to the right

What would cause this?

Also on the screen, it said about reseting the steering angle sensor/adas.

How do I go about doing this, or is it something for a garage to do?

Means somebody didn’t properly center the steering wheel before starting the alignment. Take it back.

You need diagnostics to recalibrate the steering angle sensor. 2011 RRS HSE Luxury 3.0 TDV6 Fuji White on Ebony/Ivory
Born and raised in So Cal. Moved to the UK in 2018 for a few years. Now in Poland and looking at moving back to the UK.