Ah, the portal works a little differently when it is attached to a window (e.g., in the shared space) as opposed to the portal being a free-standing ModelEntity in an immersive space.
When attached to a window, moving the window with portal also moves the world behind the portal.
But, when the portal is a stand-alone entity in an immersive space, moving the portal does not move the world behind the portal. That might make it a fun way for someone to explore the hidden, parallel world.
THeberlein
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Thanks! I activated a clipping plane to the portal ModelEntity's PortalComponent, and that helped clarify where the world's origin is with respect to the portal window (I added screenshots in a post below). I still have lots of stuff to learn, but this got me jump started.