Set snap rotation
Snap rotation positions objectsA part of a picture, including shapes, text boxes, or lines that can be edited individually. The order of objects can be changed by using the Stack. 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.