Removing persistent horizontal bar while typing on iPad

A horizontal bar pops up every time I try to write something. How do I remove it? I can slide it off the screen, but I have to do it every time and it’s driving me crazy! Help.

[Re-Titled by Moderator]

Original Title: how do i remove the horizantal bar that pops up everytime I write so anything? it drives me crazy and covers up everything I write!