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PuTTY window's title bar click the right mouse button, you can select "Full Screen", enter full-screen mode, it feels great, really fantastic.
So how do exit full-screen mode? The method is simple, mouse over the top left corner of the screen, left-click, the pop-up menu, select "Restore" or "Full Screen" to exit full-screen mode. Note that only one pixel in the upper left corner that can be activated left menu.
Right-enter full-screen menu to exit full-screen with the left menu.