In the Uuntu Unity desktop, I can't speak to the others, when a window is maximized there is a transparent horizontal bar about the size of a title bar at the top of the window just below the panel. Clicking the bar will click whatever is underneath it, such as the desktop or application window, etc.
In the Uuntu Unity desktop, I can't speak to the others, when a window is maximized there is a transparent horizontal bar about the size of a title bar at the top of the window just below the panel. Clicking the bar will click whatever is underneath it, such as the desktop or application window, etc.