Per the published model Y manual:
Mirror Auto Tilt
Both exterior mirrors can automatically tilt
downward when Model Y is shifted into
Reverse. When you shift back into Drive, the
mirrors return to their normal (upward)
position.
To turn this feature on or off, touch Controls >
Quick Controls > Mirrors > Mirror Auto Tilt.
Mirror Auto Fold
Both exterior mirrors can automatically fold
inward whenever you exit and lock Model Y.
When you unlock Model Y, the exterior mirrors
then automatically unfold.
To turn this feature on or off, touch Controls >
Quick Controls > Mirrors > Mirror Auto Fold.
Rear View Mirror
The rear view mirror is adjusted manually.
When in the Drive or Neutral gear, the rear
view mirror automatically dims in low lighting
conditions (for example, when driving at night
or through a tunnel).
Looks like auto fold and dimming of the main rear view mirror is there.