Set a video to play in ”medium size” on YouTube
YouTube now offers a newer size to play the videos you are watching. Apart from the regular small size and full screen views, a newer video watching size is available that fits in between these two categories.
The new video size allows it to play at a viewing window that is larger than the standard size offered traditionally and allows users extra space to maneuver on the screen and be able to use other applications while being able to watch the videos at a larger screen size.