How to make my keyboard normal its split in 2 pieces my step son was messing around on it I cannot seem to get

Greetings ,

my name is Dimitry I am new to this process of community ,so please if I say or ask something in a wrong way ,forgive me.

My step son was messing around on my iPad 4 and after he left my keyboard is split in 2, I don't think he likes me too much lol,please help me to get it to a normal size keyboard ,in one piece '

Thank you very much' I would really appreciate it.