Zoom

To zoom in or out the model user can choose the corresponding options in the Zoom section of the View menu or the right mouse button menu.
A user friendly way of zooming the model is to use the wheel of the mouse, or clicking the center button of the mouse while the Shift key is pressed.
To get a view which includes the whole model the Frame option must be selected.

The icons corresponding the zoom operations are the following ones:
Zoom in:
Zoom out:
Zoom frame: