When defining a Viewpoint in a Revit Topic, you can isolate specific elements using the Section Box. However, when both the main model and linked shared models are loaded into the project, only the main Revit model’s elements can be isolated.

For example, if an Architectural model includes a Structural Revit link, and a Viewpoint isolates elements from both models, Navisworks will display all isolated elements, but Revit will only display elements from the main model (in this case, the Architectural model).

Therefore, linked models in Revit will not display their isolated elements in Navisworks viewpoints. To resolve this, use the “unhide all” command in Navisworks to display all elements of the federated models.