Display Suite Extra Fields not showing in content page Display suite extra fields are shown in the manage display.  Fields such as author, user, AND submitted by, are enabled in the custom regions I have defined using a custom ds layout.  When I go to the full content page it does not show any of the extra ds fields that i enabled.  Does anybody know what the issue can be?

I'm using a custom ds layout 

custom_article:
  label: article
  category: My Layouts
  template: templates/custom_article
  css: css/custom-article.css
  regions:
    header:
      label: header
    author:
      label: author
    body:
      label: body
I would try adding a class key, for example: 

class: '\Drupal\ds\Plugin\DsLayout'


Also, I think you should update the template line, replace the underscore with a hyphen (and do the same for the actual twig file), for example:

template: templates/custom-article