I am using phone with android 4.4.4 version. yesterday suddenly one white square appeared on my screen which looks like shortcuts for keys. It is very much annoying as it appears in all screens, no matter which application I am using. I want to remove/disable it as it permanently.

I searched a lot on internet and I tried to check in settings also but nothing worked out. please help me as this is too irritating. I wonder how google could make such bad feature. Please find the screenshots below.

Problem marked in red circle.

[![enter image description here](https://i.stack.imgur.com/iGBna.jpg)](https://i.stack.imgur.com/iGBna.jpg)

When I click on square button

[![enter image description here](https://i.stack.imgur.com/Oy6iO.jpg)](https://i.stack.imgur.com/Oy6iO.jpg)

Please note , There is no **mobility** tab under my **"settings>System>accessibility>"**