The 'windows' aren't opened but the window shades are. This is because if there is to be an accident/incident requiring an emergency evacuation, it will most likely happen during those phases of flight. The shades need to be open so conditions outside can be assesed. This is especially true where there is an emergency exit, as one wouldn't want to open the door into adverse an condition like fire.
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Window Shades Retractable Awning