There are not two instances of Sigil running on Mac. Sigil on Mac uses a multiwindow paradigm much like Office. So only one instance of Sigil is running but with two Windows open. On Windows and Linux it uses a single window paradigm and so each window is mapped to its own instance of Sigil.
As there must be a Window for Sigil's GUI to function at all on Windows and Linux, on a Mac we always open the default empty window.
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