In terms of smartphone’s hardware more than wider long height are coming to the market. That’s why the 16: 9 wide screen is not fitting in 18: 9.
Some smartphone companies put features in user Interfaces, which allows consumers to adjust the existing compartment instead of watching the video with black bars.
Some smartphone companies are also which do not introduce such features in their smartphone user interface.
For those users YouTube has released crop zooming YouTube videos support.
Through this all the empty places of display works to see the videos. Although doing so, some videos get cropped while playing, but many people like to watch the video in the full screen.
Now consumers version 12.44 they can see the video in full screen from a screen size 16: 9 with a full range of screens. This version will soon be updated to all users.