AutoCAD entities generated by Intent are normally visible, unless their Render? rule is set to false. When creating drawing views of model entities, it is often desired to only show particular model entities in a given view. Intent supports this with the ViewParts rule on ViewPort. ViewParts is a list of Parts which should appear in the ViewPort image (if the view point and extents allow it to be shown). The Parts in the ViewParts list are treated recursively, so that the Part itself and any children will appear. The default value is simply {root}, which ensures that the entire model tree is visible.
Intent Parts that are created under the Layout itself are visible in the layout, and do not need to be added to the viewParts list. If they need to be hidden, the normal Render? control should be used. It is normal and standard for the formatted border of a drawing sheet to be inserted as an Insert into the paperspace of a Layout.