Fullscreen toggle not working in Uniti 2018.1

Hi, I have a settings menu with a toggle that when you press it changes the fullscreen like so:

Code (CSharp):

1. public void SetFullscreen(bool isFullscreen)
2.     {
3.         Screen.fullScreen = isFullscreen;
4.     }

But when I do the build it doesn´t work at all, I let here a screenshot with my player settings:

Thanks in advance for the help!