Scene Lights Options
Sliders are available to change the intensity of the scene's lights.
The Ambient slider controls the general overall brightness of the scene when scene lights is selected as the rendering style.
Note
Changes made in Scene Lights options will not be visible unless you have selected the Scene Lights rendering style.
Go to Tools, File Options, Scene Lights
The Scene Lights dialog is displayed:
Move the slider to affect the ambient intensity. You will see the effect your changes have on the scene in the main navigation window, as long as scene lights is selected as the rendering style.
Click OK to set these options or Cancel to exit the dialog without setting them.