Opening more than one score launches several instances of the app
Once a single score has been opened, press Cmd-O to open a new one and ... a new instance of MuseScore 4 will be created, instead of opening the score as a tab of the existing window.
This is not a new window of the same app, rather a new app launch.
I now have 4 scores open, and 4 MuseScore icons in the Dock.
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