Hi all;
When you watch some material videos you might not see the entire video on a single screen. If you press the windows key, then type control panel and then enter you can find the display option, change the display settings. Crank it up as high as you are comfortable with then try the [F11] key while in your browser [and I am sure that you are using FIREFOX] and this will take away all the extraneous trash on the screen.

Here is how it looks for me…

Dave <(-_-)>