Issue Description
Even though Zones have been placed on the Floor Plan and selected for viewing in 3D, they are not visible in the 3D window.
Solution
By default, Zones will be turned off for 3D Views. To make zones visible in 3D, follow these steps:
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Go to the View menu.
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Select Elements in 3D View.
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Click Filter Elements in 3D.
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In the dialog, ensure the Zones checkbox is turned on to display zones in 3D views.