wxt-8.x-3.011/modules/custom/wxt_ext/wxt_ext_layout/wxt_ext_layout.layouts.yml

wxt_homepage:
  label: 'Homepage landing page'
  category: 'WxT'
  class: '\Drupal\bootstrap_layouts\Plugin\Layout\BootstrapLayoutsBase'
  type: partial
  icon: images/homepage.png
  template: templates/homepage
  regions:
    top:
      label: 'Top'
      classes:
        - col-sm-12
    top_left:
      label: 'Top Left'
      classes:
        - col-sm-6
    top_right:
      label: 'Top Right'
      classes:
        - col-sm-6
    middle:
      label: 'Middle'
      classes:
        - col-sm-12
    bottom_left:
      label: 'Bottom Left'
      classes:
        - col-sm-4
    bottom_middle:
      label: 'Bottom Middle'
      classes:
        - col-sm-4
    bottom_right:
      label: 'Bottom Right'
      classes:
        - col-sm-4
    bottom:
      label: 'Bottom'
      classes:
        - col-sm-12

wxt_topic:
  label: 'Topic landing page'
  category: 'WxT'
  class: '\Drupal\bootstrap_layouts\Plugin\Layout\BootstrapLayoutsBase'
  type: partial
  icon: images/topic.png
  template: templates/topic
  regions:
    top:
      label: 'Top'
      classes:
        - col-sm-12
    top_left:
      label: 'Top Left'
      classes:
        - col-sm-6
    top_right:
      label: 'Top Right'
      classes:
        - col-sm-6
    middle:
      label: 'Middle'
      classes:
        - col-sm-12
    bottom_left:
      label: 'Bottom Left'
      classes:
        - col-sm-4
    bottom_middle:
      label: 'Bottom Middle'
      classes:
        - col-sm-4
    bottom_right:
      label: 'Bottom Right'
      classes:
        - col-sm-4
    bottom:
      label: 'Bottom'
      classes:
        - col-sm-12

# Leveraged from code provided by Acquia for the Lightning distribution.
# Kept in an abundance of caution so as to not break any layouts as a result of the Lightning deprecation.

lightning_twocol:
  label: 'Two column'
  path: layouts/twocol
  template: layout--twocol
  library: layout_discovery/twocol
  category: 'Columns: 2'
  default_region: first
  icon_map:
    - [first, second]
  regions:
    first:
      label: First
    second:
      label: Second

lightning_threecol_25_50_25:
  label: 'Three column 25/50/25'
  path: layouts/threecol_25_50_25
  template: layout--threecol-25-50-25
  library: layout_discovery/threecol_25_50_25
  category: 'Columns: 3'
  default_region: second
  icon_map:
    - [first, second, second, third]
  regions:
    first:
      label: First
    second:
      label: Second
    third:
      label: Third

lightning_threecol_33_34_33:
  label: 'Three column 33/34/33'
  path: layouts/threecol_33_34_33
  template: layout--threecol-33-34-33
  library: layout_discovery/threecol_33_34_33
  category: 'Columns: 3'
  default_region: first
  icon_map:
    - [first, second, third]
  regions:
    first:
      label: First
    second:
      label: Second
    third:
      label: Third