I could not find any full-screen toggle on a Good Example you show. Would you please kindly give us a page link which uses Cornerstone and another page link which does not use that with the same toggle to compare?
Also, I wonder if you use our version of the Revolution Slider? The one which you can install from X > Overview menu? Because it is recommended to use our version for maximum compatibility.
The other important thing is that you are using version 4.6.4 of our theme with Cornerstone 2.0.6. Those two versions are not compatible and that might be the problem cause.
Please kindly update your theme to version 5.1.1.