In the Tools toolbar, select the Transform tool or press Shift + T.
In the Tool Properties view, make sure the Peg Selection Mode is deselected.
In the Camera view, select a drawing layer. If you want to select multiple layers, hold down Shift and click on each layer you wish to select.
Place the pointer outside of a corner of the bounding box, then click and drag to rotate.
You can display a rotation handle on the bounding box when transforming a layer. In the Preferences dialog box, select the Camera tab and then select the Use Rotation Lever with Transformation Tools option. This preference is off by default.