If you press both left and right mirror adjustment buttons simultaneously it will fold/unfold both mirrors.I have had two occasions when the driver side rear view mirror did not unfold when I had started driving. I did not notice it until I was a few minutes into the drive and on one occasion, I was on the highway. Really dangerous. I had to get off the highway and park in a safe place, get out of the car, lock the car and then unlock it and it opened out. The dealership could not reproduce the issue and it has not happened again recently.
On another note, I have a real tight garage width, and it would be really nice to fold the mirrors before driving into the garage. My BMW 3 and 5 series did that and it is really helpful to get in and out of the garage.