public int getWindowYPosition() {
        return getInteger("WindowYPosition");
    }
Gets the window's initial Y position on the desktop.

<p>This setting is used only with LWJGL3, has no effect on fullscreen
windows, and is ignored if the Center Window flag is true.

@return the initial position of the window's upper edge relative to the
    upper edge of the desktop
@see #setCenterWindow(boolean)
@see #setWindowYPosition(int)
jme3-core/src/main/java/com/jme3/system/AppSettings.java