You can zoom in and out of the 3D model freely to quickly view specific parts of the model in more or less detail.
To magnify or reduce the 3D model:
In 3D Model view:
1.
Choose 3D ® Zoom.
When the command is checked, the pointer changes to
.
2. Drag up to magnify and drag down to reduce the size of the model.
Note that the Zoom command allows you to magnify and reduce the view of the 3D model. To magnify and reduce by a specified zoom step, choose View ® Magnify or View ® Reduce.