The discussion is about viewing connected replies in Discourse. @Rainshine is looking for a way to display a line connecting all replies when expanding them, as seen in a screenshot. @pfaffman responds that this feature is not possible without duplicating posts, but @Arkshine mentions that this design has been available since last year, referencing a GitHub pull request. @Rainshine discovers that the solution involves deactivating a specific checkbox, as shown in a screenshot, and shares this with the community to help future visitors.
You can’t. And people will be sad if you do because the replies that are expanded in your image will still appear below in their proper place in the post stream, and then people will complain that they are duplicated.
Discourse is designed for people to read all the posts.