SET TRUE NORTH

Place north arrow on site plan and set True North using Project Base Point

To set the True North go to the Floor Plan and select the Reveal Hidden Elements icon:
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Reveal Hidden Elements

Look for this icon:
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Project Base Point Icon

Selecting the icon will allow you to set the true North as well as the project Elevation:
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Site Settings

These setting are also available in the Properties area:
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Properties Window - Site Settings