The rotate tool allows you to rotate your view of the 3D anatomy around a pivot-point. By default, the pivot-point is set to the center of the sternum on the 3D anatomy.

Place the cursor in the 3D anatomy panel and click and drag the direction you wish to rotate the anatomy.

To set a new pivot-point of rotation, double-click on the 3D anatomy where you want to set the pivot-point and a red pin will briefly appear.

When the rotate tool is active, a view options menu appears on the toolbar next to the other interactive tools.

The view options menu is divided into two sections. The top section contains options that allow you to quickly change your view of the 3D anatomy.
The bottom section contains options for constraining the rotation of your view of the 3D anatomy.
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Pro Tips

Press R on your keyboard to activate the rotate tool.
When the rotate tool is active, press and hold Shift on your keyboard to switch to the move tool.
When the cursor is in the 3D anatomy panel, use the arrow keys on your keyboard (up, down, left, right) to rotate the anatomy around a vertical or horizontal axis.
When the rotate tool is active, double click on one of the cross-sections (transverse, sagittal, or coronal) to populate the entire cross-sections panel with that view.