In SETTINGS, go to DISPLAY. Scroll down to NAVIGATION BAR, it pops up and on the right, click on SWIPE GESTURES. This will hide the NAVIGATION Bar at the bottom of the screen. I had the same problem and missed the chance to relay more than once, but I put my SOBER MIND to work and cracked the case! I hope this helps, because I've replied to three different people with this and the my SOBER MIND stuck again, and I decided to post this here, And To Thine Own Self Be True 
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Thanks for this! I was just turning my phone to landscape so that I could see what I am typing.
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We're all in this thing together 
