The Visualization palette shows the lights that are in the current scene, and if a viewport is selected, the Visualization palette shows the lights that are in the viewport. This allows you to edit light, shadows, the intensity of the light, etc. in this viewport without affecting the lighting in other viewports.
The Visibility tool. This is a great tool for hiding objects you do not want to see. When you click on an object, Vectorworks will turn that class invisible. This tool is available in Vectorworks 2009 and above. If you are using an older version of Vectorworks, use the Navigation palette to turn off the classes you do not want to see.