Remove default layouts provided by panels

Just figured this out myself. Unfortunately there doesn't appear to be an interface for that (yet) in D8. I implemented the following hook (provided by layout_plugin) in a custom module.

Edit: Updated - there are now (since Layout discovery replaced Layout plugin) fewer default layouts and their names are now prefixed with "layout_".

/**
 * Implements hook_layout_alter().
 */
function mymodule_layout_alter(&$definitions) {
  // Disable default layouts.
  unset($definitions['layout_onecol']);
  unset($definitions['layout_twocol']);
  unset($definitions['layout_twocol_bricks']);
  unset($definitions['layout_threecol_25_50_25']);
  unset($definitions['layout_threecol_33_34_33']);
}

Hope that helps.

You might like #2849219: Provide hook to alter available layouts for IPE and follow #2764897: Make available layouts and blocks configurable.

Should #2 still work?

I got: "Drupal\Component\Plugin\Exception\PluginNotFoundException: The "layout_onecol" plugin does not exist. in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 52 of core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php)."

If i print out $definitions with kint, i can see "layout_onecol" etc.

Okay, it does work for every other layout except "layout_onecol" - maybe because this is already set as default everywhere. But i'm fine with it.

Hi, @thomas.frobieter. I think you already figured this out, but I believe you're getting the error because it *is* working (you're unsetting it, so it doesn't exist). It should disappear if you change the defaults.

#2 still applies. I'm running some DS extras as well, so I had to add the select DS layouts in the same manner to unset those too.

I'm using hook_plugin_filter_TYPE__CONSUMER_alter(array &$definitions, array $extra) to avoid error width default layout: "layout_onecol"

/**
 * Implements hhook_plugin_filter_TYPE__CONSUMER_alter(array &$definitions, array $extra).
 * @param $definitions
 */

function layout_classes_plugin_filter_layout__layout_builder_alter(&$definitions) {
  unset($definitions['layout_onecol']);
  unset($definitions['layout_twocol']);
  unset($definitions['layout_twocol_bricks']);
  unset($definitions['layout_threecol_25_50_25']);
  unset($definitions['layout_threecol_33_34_33']);
}