iPad app not listed in multitasking split view list

Question

I try to enable my existing universal iOS app for multitasking (split view), but it's not listed there, although I fulfill all requirements, I guess:

• it's universal
• iPhone and iPad app support all orientations (is this necessary for the iPhone app as well?)
• built with the latest Xcode, base SDK version iOS 9
• LaunchScreen.storyboard is used

What else could I be missing?

Answer 1

solved the problem; it was the Requires full screen checkbox:

After ticking it off, it worked as expected.

Answer 2

For me, I had to delete UISupportedInterfaceOrientations~ipad and associated array values from my info plist file - but leave the UISupportedInterfaceOrientations one.