Welcome to WordPress. This is your first post. Edit or delete it, then start writing!
Now, everything above the More block will appear on the archive page and homepage only.
Once you’re finished, you can go ahead and save your changes by clicking on the Update or Publish button.
Now if you visit your homepage or blog archive page, you’ll see the preview you just created for this post.
Are you seeing something different?
Then your WordPress theme may be ignoring your More blocks.
Some themes are designed to show excerpts and will override all of your More blocks. If your homepage and blog archives aren’t showing the preview you created using the More block, then you may need to use excerpts instead.