fullscreen

I don't know what happened to my Windows 10 Sometimes the taskbar was still visible when I enter full screen mode in the video player or streaming Here is the screenshot : Please explain to me whats wrong with it, what happen, and what should i do to solve it

Okay, so I've been searching around and cannot find anyone else with a similar problem. Basically, sometimes when going into or out of something that is fullscreen, it will just freeze on a black screen. Mouse cursor isn't visible, no keyboard shortcuts work, but Skype still works perfectly...