title: How can we leave the fullscreen mode in Haskell OpenGL?
body: <p>In HOpenGL, I can enter fullscreen mode with the function fullScreen:</p>
  
  <p><a href="http://hackage.haskell.org/package/GLUT-2.1.1.2/docs/Graphics-UI-GLUT-Window.html#v%3AfullScreen" rel="nofollow">http://hackage.haskell.org/package/GLUT-2.1.1.2/docs/Graphics-UI-GLUT-Window.html#v%3AfullScreen</a> </p>
  
  <p>But, how can we leave the fullscreen mode? Is there a function to leave the fullscreen mode? I used the function fullScreenToogle but I get a runtime error:</p>
  
  <p>user error (unknown GLUT call glutFullScreenToggle, check for freeglut)</p>