Zoom Extents centers all visible objects in an active Perspective or orthographic viewport. This control is useful when you want to see every object in a scene in a single viewport.
Zoom Extents Selected centers a selected object, or set of objects, in an active Perspective and orthographic viewport. 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.
Centers and magnifies views so just the selected objects or sub-object selections in the scene are shown in a single viewport. If no objects are selected, the effect is the same as Zoom Extents.
Centers and magnifies views so all the visible objects in the scene are shown in a single viewport.
Objects can be excluded from zoom extents all if the Ignore Extents box is turned on under Object Properties.