Split view in messages

Hi! I'm extremely new to the"I" world and I'm in need of some assistance with the messages portion.

When I go to send an iMessage on my iPad mini 4 the screen is split, meaning as I'm sending a text I see: on the left message senders, on the right the message. How do in get rid of this? It's in normal and landscape view and I HATE it!

Your help would be greatly useful !