public boolean getCenterWindow() {
        return getBoolean("CenterWindow");
    }
Tests the state of the Center Window flag.

<p>The Center Window flag is used only with LWJGL3 and has no effect on
fullscreen windows.

@return true to center the window on the desktop, false to position the
   window at (WindowXPosition, WindowYPosition)
@see #setCenterWindow(boolean)
jme3-core/src/main/java/com/jme3/system/AppSettings.java