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You can't.
As Title bar customization says,
The system reserves the upper-left or upper-right corner of the app window for the system caption buttons (minimize, maximize/restore, close). The system retains control of the caption button area to guarantee that minimum functionality is provided for dragging, minimizing, maximizing, and closing the window. The system draws the Close button in the upper-right for left-to-right languages and the upper-left for right-to-left languages.
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