Now Youtube automatically change the screen size on screen

Now Youtube change video screen size automatically, as per video uploaded via mobile, laptop or desktop

if our own video taken thru mobile or in camera, based on video screen size, it will upload and change the screen for the youtube viewers

Example 1:- below image shows that video size and its in HD view, the screen shows the size bigger, becasue video taken camera lense size settings are diffrent so it shows us little big format,

Example 2:- below image is normal youtube video image, which we see normally on screen

NOW YOUTUBE CHANGED THIS VIEWING FORMAT FROM 2018 APRIL ONWARDS