Gray bar at the bottom of iPhone screen?

So today I unlocked my iPhone and I saw that there was a gray bar at the bottom but it doesn't appear when I'm in an app, how do I get rid of it

I read this gay bar lol

Try the following steps, it might help you and you must have the most advanced security app that could be very much useful for you, LEO Privacy
Settings - General - Accessibility - Increase Contrast = Make adjustments here