Samsung Galaxy Core LTE Navigation Bar

[AC Question]

Just today the navigation bar at the top of the phone screen is on constantly with every action. It only started today after downloading a final fantasy game which made it hard to play because it's somehow interfering with the motion sensor so the phone shuts the screen off even while the game is still active. It does this for all things now, even reading manga. I have searched for answers but theyre all for older phones which has options that are not even available on this one. I don't have a watch ap and I should not have to download a root kit considering the short time of this problem, plus I do not want to get into things I do not understand. I have tied restarting and powering down multiple times, removed youtube and everything system wise is up to date. Any help is appreciated.