@mattewwade I'm on macOS (Opera One 120.0.5543.161), but the red button only closes singular windows for me, both from testing and from what the browser tells me should happen. When "Warn on closing window with multiple tabs" and "Warn on quitting Opera with multiple tabs open" options are both enabled, (they have different pop-up text), the window text displays when I use the red button, and the quitting text displays when I properly quit Opera using the Menu Bar or right-clicking the app for "Quit".
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