That's the point - As a sibling comment says - there is a small replica and then suddenly I saw the whole painting at the end of the central corridor. This was a "wow" moment, and an unexpected one
Not only does it take up the entire wall, IIRC part of it was actually cut in order for it to fit that wall.
The sides were cut to fit a place in the old city hall (now palace) on Dam square in 1715.