It operates the viewpoint on 3D screen.
You can reset a view by View header > [Disp] > [View panel] if you miss where the view displays.
It scales a view by 
dragging up or down.
It moves the viewpoint.
If you use 3 button mouse, you can move by 
dragging a mouse with pressing the middle button on 3D image without selecting this command at the default setting.
It rotates the viewpoint.
The center of rotation changes according to Center of rotation in Configuration.
You can set up in [Configuration] when you want to rotate 360 degrees up and down freely. And you can also change the type of rotation like a trackball in the configuration.
You can rotate by 
dragging a mouse with pressing the right button on 3D image without selecting this command at default setting.
It changes the distance between the eye position and the fixation point without changing the viewing angle.
You can zoom as dolly by dragging a mouse with pressing the middle button or 
both the right and the left buttons on 3D image without selecting this command at the default setting.
Change the position of the clip plane.
Objects are displayed only one side with the clip plane as the boundary when [Viewheader > Display > Clip plane] is checked.
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| One side with the clip plane as a boundary is hidden. |