How to hide navigation bar

How to hide this navigation bar ?
Whenever i play video in full screen than video full screen video play with navigation bar like this

image try this


It not working when i hide it, it turns black

its show black bcj video not cover full screen thats why . You see black bar also show on top also . thats why .

What I know of, even if you hide Navigation bar you won’t gain any screen size and yes you get black or white part where Navigation bar should be


Any solution to gain space?



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