When copying a V3d_OrthographicView via
V3d_OrthographicView (const Handle(V3d_Viewer)& VM, const Handle(V3d_OrthographicView)& V)
the default view mapping is not preserved but just set to the current view mapping of V.
The problem becomes visible if the view V was scaled and the new view is scaled again because scaling is relative to the default view mapping.
Now, when you start the Import Export sample and click (twice) on the button for creating a box, it will appear without being fit on the window.
If you comment out the scaling of the second view the box will be bigger, although second view is just a copy of the first view and is scaled by the same factor.