Custom layouts with the Display Suite module
In your theme folder, create a THEMENAME.layouts.yml file:

clean_empty:
  label: Clean empty page layout
  category: Display Suite
  class: '\Drupal\ds\Plugin\DsLayout'
  type: partial
  template: templates/nodes/clean-empty
  regions:
    title:
          label: Title
    ds_content:
      label: Content


Then just create your twig file. In this example, create a clean-empty.html.twig file inside THEME/templates/nodes:

{#
/**
 * @file
 * Custom display suite layout
 *
 * Available variables:
 * - title
 * - ds_content: content region
 */
#}
{{ title_suffix.contextual_links }}
&lt;h1&gt;{{ title }}&lt;/h1&gt;
{{ ds_content }}