The View Control is used to;
Rotate the structure model in the 3D View.
Zoom , Pan, or change the Perspective distance of the structure model in the active View.
When this command is executed, the View Control is displayed in its sleep state in the upper right corner of the active View.
Move the mouse pointer to the upper right corner of the View to wake up the View Control, as shown below.
View Control in the Sleep State.
View Control in the Awake State.
Each part of the View Control performs a different function;
Click on an arrow to Rotate the structure model.
Click & drag the circle clockwise or counter-clockwise to Rotate the structure model.
Click & drag to Pan the structure model.
Click & drag to Zoom the structure model.
Click & Drag to change the Perspective distance from the structure model.
Click on the star to Reset all View Control parameters to default values.