I first heard about the small increase in size when onboard the Viking Sun back in 2020.   Being retired now for 10 yrs, I don't pay too much attention to SOLAS changes, so I don't know what changes are requiring the increased size. However, in general terms, increasing a ship's beam increases the Metacentric Height (GM) and Righting Lever (GZ), which is the force that returns a ship to the upright, when inclined.   All based on a similar distribution of weights.
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