From the Autodesk App Store:
Due to the popularity of the Maximize AutoCAD tool, a similar tool was created for Navisworks to aid in working across multiple monitors. Very simply, this will cause Navisworks to span across all screens of your computer. After that you can use the built in Split View to split your views, or you can fill one screen with Navisworks controls (like the clash navigator and selection tree) leaving one full monitor for viewing your model.
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| Spanning 3 monitors with the… |