The Scene Fading locomotion is a hand locomotion; a Scene Fader can be enabled on each hand of the player via locomotions cycling. As with any other hand locomotion, this must be done for each hand for which you want its locomotion to become active.
If the player holds down a Scene Fader's input long enough, the Scene Fader will completely fade out the player's vision and then load/reload the specified scene. The toolkit's scenes demonstrate Scene Faders that reload the current scene by default.