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I.e. the video shows both horizontal and vertical black stripes instead of giving the option of (or automatically) zooming into the 21:9 visible part of the 16:9 video stream.
Example: "Foundation"
To clarify: Apple TV+ sends 16:9 frames which, for shows like "Foundation", contain 21:9 content letterboxed above and below. Monitors such as my ultrawide, unlike TVs, don't offer alignment to content width, thus losing above/below black strips. This should really be a viewport option on the Apple TV+ browser app.
Ultrawide monitor 3440x1440 does not fill up in full screen when watching letterboxed 16:9 content on Apple TV+ (Windows, Edge browser)
