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On the Change or Relationship toolbar, depending on the application you are using, select Horizontal/Vertical .
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Do one of the following:
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To make a line horizontal or vertical, select the line.
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To make two key points horizontal or vertical, select a key point, and then select another key point.
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The current orientation of the line determines how it is positioned after you select it. For example, if a line is closer to a horizontal orientation than a vertical orientation, the line becomes horizontal.