Use this dialog box to choose a background effect to use in the Scene View
Selects the type of background effect. Choose from:
Plain
Graduated
Horizon
Sets the color for a plain background.
Sets the top color in a graduated background.
Sets the bottom color in the graduated background.
Sets the sky color (top) in a horizon background. This option is available for 3D models only.
Sets the sky color (bottom) in a horizon background. This option is available for 3D models only.
Sets the ground color (top) in a horizon background. This option is available for 3D models only.
Sets the ground color (bottom) in a horizon background. This option is available for 3D models only.
Ribbon: View tab > Scene View panel > Background
Shortcut menu: Right-click a blank area in the scene, and click Background on the context menu.