Happy WBW! How does your world view, handle, and show anger? Is anger a commonly seen emotion—in public or private? Is anger loud or worked through quickly and quietly? Are you socially supposed to handle it yourself or is it equated to strength?
Hmm... anger is generally supposed to be handled in a more private place rather than just out on the streets, but people are not expected to never express the emotion. It's not uncommon to see someone experience or express their anger in various ways, most people just have to be conscious of their status sometimes.
Like Celesto, when she becomes Queen of Wisea through her marriage to Ansellus, has to learn to not have "outbursts" or remove herself from situations that bring up the emotion within her. In the Forsaken Valedom, where she's from, she was able to express anger freely and had various ways to let off steam (like sparring with one of her friends or something). In Wisea, it's a different culture and she's gained a higher status so things that she's used to doing are either not allowed outright or meant to be expressed in a "more proper" way.
Handling it yourself vs having help handling it is on a case by case basis. Some people are expected to be able to handle it themself, but others have people they can talk to about it.
To his credit, Ansellus does try to help Celesto with the transition and tries talking with her about how THEY can deal with the things that upset her. He genuinely wants to help her as best he can. But Celesto's personality is different than his. Sure, she may let go of some anger pretty quickly, but the times she can't she's not able to just talk it out (at least not immediately most of the time) and she needs to have an outlet for it.
Ansellus experiences most of his anger in a more controlled manner. The most he's ever done is raise his voice a bit or, once, slam his fist against a table. Other than that, he's able to hold onto his anger and remain outwardly calm for longer periods of time until he does get a chance to "constructively" let it out (hunting, horse riding, etc). That's because he's been raised to be a king since he was young and that's how he was taught to behave.
Literally in chapter one of Dread Secrets (in this draft), two immortals have a very public argument with lots of yelling and devolving into threatening one another. People are curious about what's going on and come out of buildings to see what's happening, but no one intervenes (yeah, probably because that's two immortals what are you gonna do about it as a mortal lmao) until the third immortal arrives to split it up. Neph, for their part, stays as out of it as they can... even though they were the focus of the argument. Neither immortal is actually a threat to anyone but their own egos, so Neph is just amused about the argument.
tldr: It's a case by case basis that is also at least partially cultural within the world of Exhalo of how people express or handle their anger. Sometimes expressing anger is seen as a weakness, other times it is seen with respect because it means you feel deeply about something.