Hello. UNA has ConteXt apps (Groups, Events, Spaces, etc) and ConteNt apps (Posts, Photos, Videos, etc). Context may have its own Create Post form which allows to post Content in Context. But some Contexts, like Groups and Events, can be posted in Context too. It was made to allow users? for example, to post Events in Groups. So, this setting tells the system that Context (for example a group) which was posted in another Context (for example a space) will be treated as Content. It means that this new group won't have its own Create Post form and another content cannot be posted in it. It was added to allow the admin to limit nesting with only 2 levels: Context and Content. Avoiding situations like Post in Group, which is in Event, which is in another Group, which in another Event, which in its turn in Space, etc, etc, etc.