Interaction with IOS multiprocessing is spotty, and it's likely to get move complicated
with the new Ipad-os.
develop builds work in all 3 modes - as floating second app, as base app with a floating second app,
and in bonded/pair mode with a dividing bar.
release builds only work as the base for a floating second.
I can't find any build hints or other differences that explain this, but it
would be nice if release builds were as capable as develop builds.