Took me a hot second to notice, but a lot of the impactful/establishing panels in Wano are accompanied by the sound effect べん/ben or べべん/beben (the sound effect for a shamisen, the three-stringed instrument Hiyori plays at the opening of the arc). Whereas in the rest of One Piece such panels would ordinarily be marked with the sound effect ドン/don (or DOOM in English) instead.
It’s not a complete swap over- for example, stuff the Strawhats and Law do is still usually marked with the usual don, as they’re outsiders to Wano- but the ben does show up on all the establishing shots of Wano’s scenery and characters. It kind of gives the impression the instrument is being played through all of this as an accompaniment to the action, which is a real cool framing device.