Selecting the View - Zoom - Fence allows you to zoom in on a section of the model that you select using the arrow cursor.

1. Move the arrow to one corner of the area to be zoomed in.
2. While holding down the left mouse button, drag the arrow to the opposite corner of the desired area. A rectangle indicating the zoom area will appear and expand.
3. Release the mouse button.

The screen will redraw with the selected area enlarged to occupy the entire screen.