1. To zoom, turn on the Zoom button or hold the Z hot key and click and drag in any viewport.
2. To pan,
turn on the Pan button, or hold the X hot key and click and drag in any viewport.
3. In WebCam view, you can also orbit. Turn on the Orbit button, or hold the C hot key and click and drag in WebCam view, to the left of these instructions.
4. To frame all objects in the active viewport, press A. To frame
all objects in all viewports, press Shift+A. Note: Click a viewport to make it active; its label turns green.
5. To frame the selected object in the active viewport, press F.
To frame it in all viewports, press Shift+F. Note: You can select objects in the World Explorer.
6. To reset the zoom, pan, and orbit to their defaults, choose View
> Viewpoint > Reset Viewpoint, or press Shift+Q.