How do I undo the split screen on my iPhone 5s chat screen?

[iMore Question]

how do I undo the split screen on my iphone 5s chat screen

When I go to the chat screen, the screen is split equally into 2. I need help to undo it.

 

[nikkisharif]

Re: how do I undo the split screen on my iphone 5s chat screen

I'm not sure what you're referring to. Are you in a specific app?