lightning_layout-8.x-2.x-dev/lightning_layout.layouts.yml

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