The Shading viewport label menu lets you choose how objects are displayed in the legacy viewport.
3. Shading menu
The "legacy" viewport drivers are Direct3D and OpenGL. See Display Driver Selection Dialog. These drivers have driver-specific configuration options, in addition to the options on the Viewport Configuration dialog.
Lets you choose from among the most commonly used shading styles.
For legacy viewport drivers, shading styles are described in the topic Rendering Method Panel. (In the legacy version of the Shading menu, some additional styles are available from the Other Visual Styles submenu.)
Displays a submenu with options for lighting and shadow previews in viewports.
Sets the quality of transparency display in the viewport:
Displays a submenu with other shading modes. These include:
Displays a submenu with options for displaying a background in the viewport.
These options affect how selected geometry appears in shaded viewports.
When off, selected faces are indicated by red edges only.
Viewport lighting affects viewports only: It has no effect on how the scene is rendered.
When chosen, the viewport uses lighting from light objects in the scene.
(The default.) When chosen, the viewport uses lighting from the default lights.
Ctrl+L toggles between using scene lights and default lights.
To "lock" a light means that the light will stay on until it is unlocked, whether or not the light casts shadows. When a light is locked, choosing Auto Display Selected Lights does not turn it off.
The choices that follow are toggles.
When on, the viewport is displayed using your system’s hardware shader.
Keyboard shortcut: Shift+F3
When on, the viewport previews shadows. See Previewing Shadows and Other Lighting in Viewports.
When on, the viewport previews ambient occlusion.
Displays the Lighting And Shadows panel of the Viewport Configuration dialog. This lets you turn hardware shading on or off, and change other options.
To customize the gradient colors, use the Customize User Interface dialog Colors panel Viewport Background Gradient Bottom and Viewport Background Gradient Top options.
To customize the solid background color, use the Customize User Interface dialog Colors panel Viewport Background option.
To choose an image file for one or all viewports, use the Viewport Configuration dialog Background panel.