If you are asking what I think you are asking, there is no way to maximize the game window as you would a web browser. You can however change your windowed game resolution in order for it to take up the entire screen minus the start bar. You can also hide the start bar by right clicking it, selecting properties, and checking the option to auto-hide your taskbar. It is important to note that the resolution you set when you are in full screen mode is independent of the resolution you set in windowed mode.
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