A group of poems must have a "group". As the name implies, no matter modern or ancient times, at least two poems can form a group. Take Li Bai as an example. There are four moons for drinking alone, but there are also 1 1 written by him. It's hard to say how many poems are formal. Poets often write poems because the same theme and related themes inspire him a lot. Capitals in the poetry group are written separately, just like your family can be a big family or a small family, but each family member is an independent person.
My direction is not modern poetry, so I don't know much about it. I don't know how to express it clearly. I hope I can help you.