This entirely ruins the experience of going into fullscreen mode. They have stated that even in full-screen mode, the taskbar is visible. However, in recent light, many window users have reported an issue with fullscreen mode.
Usually, when you go into full-screen mode, Windows hides the taskbar and pretty much everything on the screen except the content you are viewing. The fullscreen mode facility has been provided to users so that one can focus on whatever the user is doing, without having any distractions.
