How to set post announcement sizes in WordPress?

Question

WordPress

Hello community! I'm scratching my head over how to implement a manual announcement size designation in the WP feed. All this disgrace will look like this: It is

necessary that when adding a new post, you can choose what width its announcement will be: full, half, or a third of the full.
I would be glad to receive some advice or a direction vector in the direction of which I need to dig :)

Answer 1

Create a meta field for the post editor (via https://codex.wordpress.org/Custom_Fields or https://www.advancedcustomfields.com/ ), specify the number of columns you need in it. Well, then you check this field in the frontend and ... that's it.