Hi There ,
are you still using the App that QBO have stopped supporting? I am too.
When you say split screen, do you mean two screens or how else are you splitting your screen. If you have a ig enough screen you should be able to have the APP in one window and your Windows app in another.
If the your windows app is feeding the APP then maybe the Windows app needs a tweak. I use QBO using the app across two screens, and in multiple tabs.
If your copy and pasting this should still work. If you can let me know I might have another idea.on fixing the problem..
Hope that helps a bit.
Kindest regards
RoscoPC