Is it possible to opt your iPad app out of multitasking on iOS 9

Question

I have a large app that I will need some time to optimize for iOS9.

Edit: What I am worried about is all the UI getting squeezed together when the app window size i

Answer 1

It's still possible to opt-out of iPad multitasking — but Apple announced at WWDC 2019 that in April 2020, all iPad apps will be required to support multitasking.

The original announcement and discussion is in the first few minutes of "Modernizing Your App for iOS 13", and there's a (brief) announcement on their developer-news site as well.