To zoom to the position of the pointer:
Spin the wheel forward and back. While spinning the wheel, keep the pointer on the area where you want to zoom. (If the pointer is outside of the graphics area, the center of the model zooms into view.)
To zoom to the center of the screen:
Click , then spin the wheel forward and back. To change the direction of the mouse wheel for zooming in and out, select Reverse mouse wheel zoom direction in View Rotation/Zoom Options.
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