Invisible Google Slide Control Bar

Have you ever thought it is annoying that when presenting the Google Slide, the control bar shows while the cursor nearing it?

Now, you can control when to display/hide the Google Slide control bar by pressing a button!

Also, you can go for a toy example on the simple test page:
https://docs.google.com/presentation/d/1fUmsYkhQBpPGDVM1ErU8aL7bc0LmANjq8JA4WE0AjIs

The source code is open at https://github.com/thumbe12856/chrome-extension/tree/master/Invisible%20Google%20Slide%20Control%20Bar