Fyi, you really can not tell the difference visually between two different instances of Sigil open each with their own main window and two main windows opened by the same instance of Sigil on a Mac so it would present itself no differently. You would still be choosing a single window to work in with the possibility of switching to the other window by clicking on it. Nothing is stacked or tabbed so their really is no advantage to how the Mac does it at all, it just works around the Mac not liking multiple versions of the same gui program running at the same time.
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