a) To use this feature, system navigation buttons should be enabled: Go to 「Settings」->「Button & gestures」->「System navigation」->「Buttons navigation」.
b) Then go to 「Settings」 -> 「Accessibility」 -> 「Accessibility Menu」 -> 「Accessibility Menu shortcut」, touch the trigger to activate it->touch 「Allow」 -> 「GOT IT」 ->the accessibility button
![](http://tct-open-document.s3.ap-northeast-1.amazonaws.com/image/Smartphones/南宫ng·28+30/image2.png)