Each of these View Controls will affect the view for the World View viewport they are located in.  When you have multiple views, each view will have its own controls.  Note:  Not every view type will be able to access these controls.  For example if you are viewing from the Camera View, these controls will not show up, because you use the camera itself to adjust the view.

Center:  Centers the view onto whatever item you have selected.  Note: It centers based on the pivot point of the item.  This option is not available for Camera and Object views.

Move:  Moves the view in the viewport (World View).  Left-click and drag to move along X and Z.  Right-click and drag to move along Y.  Note: This feature is not available for Camera and Object views.  Quick Key: Ctrl-Alt plus left mouse drag for X/Z, and right mouse drag for Y.

Rotate:  Rotates the view in the viewport (World View).  Left-click and drag to rotate along pitch and heading.  Right-click and drag to rotate on bank.  Note: This feature is not available for Camera and Object views.  Quick Key: Alt plus left mouse drag for pitch/heading, and right mouse drag for bank.

Zoom/Dolly:  Left mouse button Zooms in and out.  Right mouse button dollies (moves) in and out.  Quick Key: Shift-Alt left mouse drag.  Additional Quick keys (without mouse): ,(comma) and .(period) for small zoom in & out increments, or <and >for larger zoom in & out increments.,

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