Use Shadows to provide a better sense of volume and positioning.
Appearance panel, expand the
Shadows list, and select shadows to display:
All Shadows displays shadow effects for all visible scene objects.

Ground Shadows casts a model shadow onto the ground plane. Does not require the ground plane to be visible.

Object Shadows sometimes called self-shadows. Casts and receives model shadows based on the position of the active lighting style.

Ambient Shadows casts shadows in corners and cavities to visually enhance the transition of shape changes.


Appearance panel, Expand the
Shadows list, and click
Settings.
Styles and Standards
panel
Styles Editor click the
Shadows tab. Shadow settings, Density, Ambient Shadows, and Softness work with Standard Lighting styles. Softness works with Environment Lighting Styles while Density and Ambient Shadows are derived from the environment image.