To display the model boundary surfaces, create a new geometry scene by right-clicking on the Scenes node and selecting New Scene > Geometry.
This opens a new visualization display displaying all region outlines and boundary surfaces colored by boundary type and looking onto the XY plane down the Z axis.
Use the various view manipulation tools to navigate around the geometry by zooming, panning and rotating.
You can also identify parts of the geometry by name, hide some parts and see the mesh outline as well.