Articles not saved in correct content area

Hello
Just trying Kirby for the first time after using Perch CMS for many years. All has gone well so far.
I have become stuck on one point that I can’t find a solution for.
I have followed the blog cookbook example and added a tab to my site blueprint, I can create articles and publish them, but they are not saved in my content under 4_blog, but instead are saved in 0_article-one.

      # blog tab
  blog:
    label: Blog
    icon: 📚

    pages: blog

    columns:

      left:
        width: 1/2
        sections:
          drafts:
            extends: sections/articles
            headline: Drafts
            status: draft

          unlisted:
            extends: sections/articles
            headline: In Review
            status: unlisted

      right:
        width: 1/2
        sections:
          listed:
            extends: sections/articles
            headline: Published
            status: listed

and this is my article.yml

title: Article
num: '{{ page.date.toDate("Ymd") }}'
icon: 📖

pages: blog

status:
  draft:
label: Draft
text: The article is still in draft mode. It can only be seen by editors with panel access.
  unlisted:
label: In Review
text: The article is online and can be visited with the direct URL. The team must still give the final go to publish it.
  listed:
label: Published
text: The article is online and listed in the blog

columns:
  main:
width: 2/3
fields:
  text:
    type: textarea
    size: large
  intro:
    type: textarea
    size: small

  sidebar:
width: 1/3
sections:
  meta:
    type: fields
    fields:
      date:
        type: date
        time: true
        default: now
      author:
        type: users
      tags:
        type: tags

and finally my articles.yml

type: pages
headline: Articles
info: "{{ page.date.toDate('d.m.Y') }}"
template: article
empty: No articles yet
sortBy: date desc

How can I get the articles saved in the 4_blog section?

The articles section doesn’t have a parent. If you don’t set a parent page, the children are created in the parent folder (as seen from the blueprint where the section is used)

type: pages
headline: Articles
info: "{{ page.date.toDate('d.m.Y') }}"
template: article
empty: No articles yet
sortBy: date desc
parent: site.find('blog')

Thank you, that worked a treat