With the new update to YouTube’s Android app, all of your videos will now fully fit and your black bars will disappear. The videotapes shot in square and vertical format had black spaces on their sides because they did not fit the standard 16: 9 aspect ratio; Thanks to the new update, this situation is getting out of hand.
Square and vertical video will occupy the largest possible area and use your screen efficiently. All you have to do is touch one of these types of videotapes while you watch one of the “magnify” keys on the bottom right. When you slide down the screen, the video player automatically switches to landscape mode and opens up extra information.