Resolved gh-341 that adds the feature to expand the custom field option far beyond the default. Moved the menu prefix option in to the Joomla component area -> tab -> Settings to allow each component to override the global setting.

admin/layouts/joomla_component/settings_fullwidth.php

@@ -15,7 +15,7 @@ defined('_JEXEC') or die('Restricted access');
 $form = $displayData->getForm();
 
 $fields = $displayData->get('fields') ?: array(
-	'spacer_hr_six',
+	'spacer_hr_seven',
 	'note_on_contributors',
 	'addcontributors',
 	'emptycontributors',