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watching Amazon prime movie, always shows in letterbox format, not full screen

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every time I try to watch movie from Amazon prime it shows in letterbox format, on both monitor and TV. u-tube is OK, will play full screen.

every time I try to watch movie from Amazon prime it shows in letterbox format, on both monitor and TV. u-tube is OK, will play full screen.

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You may have accidentally zoomed web page(s). Reset the page zoom on pages that cause problems.

  • View -> Zoom -> Reset (Ctrl+0/Command+0 (zero))