How to play YouTube video in floating in note 5 ( only vdo part)

[Uttam Kumar Khadka]

One day I was playing YouTube video and I accidentally touched the side edge of screen and YouTube video played in floating in home screen. But I I tried again but couldn't. I know it has split screen but in split screen whole page which covers maximum area of screen . so is there any method to play the floating vdo part only . is it possible..???