Snap rotation positions objectsA part of a picture, including shapes, text boxes, lines, or animations, that can be edited individually. so they are exactly horizontal, vertical, or at 45-degree angles. As you rotate an object near the 45-degree increments, the object "snaps" to that angle, ensuring the object is exactly horizontal, vertical, or at a 45-degree angle.
To turn snap rotation on or off:
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On the Tools menu, click Snap Rotation.