Android 4.4 KitKat background button gone, home button doesn't work. How can I get the background button back?

A

AC Question

Android 4.4 kit Kat back ground button gone, home button doesn't work

I have 8 download arrow in top left corner.
My background button or square is gone off the bar you pull up from bottom, so I can not delete/ close apps.
What do I need to do to get the background button back.
 

B. Diddy

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Re: Android 4.4 kit Kat back ground button gone, home button doesn't work

Welcome to Android Central! Which phone?
 

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