How do I hide and show individual parts?

How do I hide and show individual parts?

When a 3D PDF model has multiple parts, each part can be hidden or shown using the “Model Tree” menu. This can be enabled by an icon button on the toolbar over the 3D view, or by using the right mouse drop-down menu. When the 3D model parts are organized into a hierarchy, each level can be opened with the “+” symbol. A tick-box next to each part name sets current visibility. The PDF3D generation tools also allow the author to specify initial part visibility.  Views can be defined where part visibility is set on a view by view basis.