As a programmer, I absolutely gave up on the multitasking on my iPad Pro. I don't use it in such a way and usually don't care. And the very few cases I wanted to use it like that I couldn't succeed in doing it even after my wife showed me 3 times (she uses her own iPad Pro in split screen very often and gotten used to the gestures; and even she makes mistakes occasionally).

Just an anecdote. I am a very technical user and I still got confused by the multitasking / slide-over thing. So I just ignore it.