Tesla MODEL X 2019 Owner's Manual page 64

When Tow mode is active, Model X
displays this indicator light on the
instrument panel, along with a
message telling you that Model X will
roll freely.
Note: In Tow mode, Model X does not shift
into a driving gear. To cancel Tow mode, shift
into Park or touch Tow mode again. Tow mode
also cancels if you use the touchscreen to
apply the parking brake (Controls > Safety &
Security > Parking Brake).
Driving
Gears
63