As a comparison
Here is what the Sony and Nintendo stuff looks like at the same place that has the Steam Deck.
Here is an article about the store itself and some of the stuff inside.
エディオンは12月15日、複合商業施設「CeeU Yokohama」内に「エディオン横浜西口本店」をオープンする。
game.watch.impress.co.jp
It looks like there is no Xbox presence in that store at all. So Nintendo I think has 2 huge spots in that store and then PlayStation and Steam Deck have similar size spots in the store as crazy as that might be. But there is also a lot of other stuff like esport and gaming PC stuff and things.
In general that store feels like a mini Ikea? Since I think Ikeas in general are still way larger than that and this store doesn't take up all of the buildings only parts of it. It's still pretty cool though and like it says in the article about one of the people, they don't have to go to a specialty store to get PC stuff for their kid.
(Sorry for posting this so late)