This parameter is shown at the lower left in the Main and Rotor Cabinet windows.
Rotation switch: Switch the rotor speed between Slow, Brake, and Fast modes.
Slow: Slow rotor movement.
Brake: Stops the rotor.
Fast: Fast rotor movement.
Note: When using a pedal to control rotor speed, you can hold down the pedal for a second or so, then release it to activate braking. Repeat to switch to the previously active speed mode: Fast or Slow.
Download the guides:
Logic Pro User Guide: PDF