Rotating an object or component changes its orientation. Rotation happens around the pivot of the object. If you have multiple objects selected, they rotate according to their common pivot point, which is the last object added to the selection (the key object). For components, the pivot point is located at the center of all selected components.
To rotate objects or components
If you want to first change the settings for the Rotate Tool, double-click its icon to display its options in the Tool Settings panel.
You can also rotate objects or components with the Combined Move/Rotate/Scale manipulator.
To rotate with precise values, see Move, rotate, and scale using precise values