"ONE TAP LOCK BUTTON" not available in my note 9

[matty11]

Hello guys
I recently bought my new note 9..
I can't find LOCK BUTTON ON SCREEN .. I ain't talking about lock button on right hand side panel.. I am talking about virtual button on screen which we can press and phone shall be locked. Without pressing right hand side lock panel button.. I have attached screenshot of such "lock buttons"..

Kindly help me to find it.. I think it was available in older version of note 9.. 
Plzz help..!!

[Bibhab123]

download goodluck app

[matty11]

still not got any solution??

[iShivaay]

Use Assistant menu

[matty11]

ishivaay.. yah that's the only option.. thanks..

[chetan01]

Use Assistant menu....