> Oh, and apps that aren’t in the Dock can’t become the second app in split screen mode. What sense does that limitation make? I've heard people say this before, as if there's no way to use anything but your permanent dock apps in split screen. But if it's not in the Dock, you launch it, and now it's in the dock. That's why the recent items section on the right side exists. My personal gripe with iOS multitasking is…
I’ve had an iPad for over a month now and still can’t figure out how to close the second app when I am in split screen.
Once they're separate, you can close them from the app switcher by swiping them off the top of the same, same as an iPhone.