You can change the light on top of the monitor arc in the Cradlewise app under Settings > Crib > Crib Light.
Turn on Smart Mode to have the light automatically adjust to the ambient light in the room, making it brighter when the room is brighter or dimmer as the space becomes darker.
Turn off Smart Mode to manually adjust the brightness of the light.
Slide all the way to the left to turn off the light completely.