How to manually disable or hide the system bar (menu bar) at the bottom of the screen? I am using an ASUS Transformer TF300 with Android 4.1.1, and there is an app that shows the playing cards at the bottom of the screen, and show the "Continue" button when the card game is finished.

But the playing cards are half hidden by the system bar, and this "Continue" button is hidden by the system bar mostly, except about 2mm is showing, so it is kind of difficult to press the button.

Is there a way to tell the system bar / menu bar to hide itself?  I also went to the settings and set the "System bar lock" to off, but somehow the bar is still showing.
this system bar is part of Android, and is used when the device doesn't have any hardware buttons to press.

As such, it cannot be hidden.

It shouldn't, however, impact upon gameplay - this is an issue with the app, and you should contact the app developer to have it fixed.