Just go to "that" note, and open it in the external editor.
This works if you do NOT specify any external editor in the Joplin settings dialog.
In my case (on macos too), I am using the "Drafts app" from the appstore. Other should work to. But beware this solves the "pop out" problem, you get your external window. Editing the note and returning the updated note to Joplin does not work (yet ?).
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