iOS gesture idea: pause on a horizontal swipe to enter Split View.
[Here’s simple mock-up to visualize.](https://youtu.be/YJGPN72HMz8) Ignore the actual home bar and try to notice what’s going on with the other one behind it.
It seems like this gesture would be easy to implement and consistent with current interactions. I’m also not sure if there’s any reason why the Slide Over bar is still up top.