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 Zoom Extents All centers all visible objects in all viewports. This control is useful when you want to see every object in a scene in every available viewport.
 
		  Zoom Extents All centers all visible objects in all viewports. This control is useful when you want to see every object in a scene in every available viewport. 
		 Zoom Extents All Selected centers a selected object, or set of objects, in all viewports. This control is useful when you want to navigate to small objects lost in a complex scene.
 
		   Zoom Extents All Selected centers a selected object, or set of objects, in all viewports. This control is useful when you want to navigate to small objects lost in a complex scene. 
		To zoom all objects in one viewport:
The viewport displays all objects in the scene.
To zoom on a specific object:
The viewport displays the selected object.
To exclude an object from Zoom Extents:
Use this procedure, for example, to ignore lights that are far away from the other objects in the scene.
The object will now be excluded by Zoom Extents and Zoom Extents Selected.
 Zoom Extents All Selected
 Zoom Extents All SelectedCenters and magnifies views so just the selected objects or sub-object selections in the scene are shown in all viewports. If no objects are selected, the effect is the same as Zoom Extents All.
 Zoom Extents All
 Zoom Extents AllCenters and magnifies views so all the visible objects in the scene are shown in all viewports.