1) To use this feature, system navigation buttons should be enabled: go to 「Settings」->」Button & gestures」->」System navigation」->」Buttons」.
2) Then go to 「Settings」 -> 「Accessibility」 -> 「Accessibility Menu」 ->touch the toggle to 「On」 position->touch 「Allow」 -> the accessibility menu icon
![](http://tct-open-document.s3.ap-northeast-1.amazonaws.com/image/Smartphones/南宫ng·28+20+Pro+5G/image3.png)