User Guide > Rendering and Render Setup > Lighting > Basics of Lighting > Position features of a light interactively >
Move barn doors (shutters) of a spot light
Move the Barn Doors manipulators to make a spot light’s beam square, or to flatten one side of the beam. You can also change the spot light’s Barn Door values in the Attribute Editor. Only the spot light includes this option.
To use barn doors, see Apply barn doors (shutters) to a beam of light.
To show the manipulator, see Show, hide, or resize a light manipulator.