Yeah that's a user interface fail for sure.
In the bus, the throne room door isn't quite wide enough to close off the passageway, so they have pocket doors on either side of the passageway to close off the athwartships head. Which is a solution, albeit an expensive one.
When I redid the bathroom on my old 32BA, I had to replace the throne room wall. Which was easy enough, it's just framed up in 1x2 pine. Could have had a custom door built, that would latch into the far wall when open. Only problem is, Her Majesty does not prefer to shower in full view of me doing my business, so that solves one problem and introduces another.
They solved that problem in the bus by putting in pocket doors on either side of the passageway, which works great but would be an expensive fix.
I was kicking around the idea of hanging a shoji door I could slide across the passageway, which would have been dang cool, but wound up hanging a curtain (actually a noren cuz I was kind of on a zen kick at the time) which was fine, I mean really you don't need to seal it off, just need to not freak out the people walking past the front of your rig, right?
2008 Tiffin Allegro Bus