[racket] TR: (almost) no way to dismiss performance report window?

On my mac, the window summoned by a double-click after running Performance Report has no close box, and no close buttons, and no obvious way to dismiss it.  It turns out that choosing "Racket > Quit" from the menu gets rid of it, but on a Mac, this is *severely* unintuitive, as it appears that you're closing the whole application. Am I doing something silly?

John

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