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Main menu dropdown parent item clickable in Drupal 8 using Bootstrap 4

 Edit menu--main.html.twig template file {# /**  * @file  * Bootstrap Barrio's override to display a menu.  *  * Available variables:  * - menu_name: The machine name of the menu.  * - items: A nested list of menu items. Each menu item contains:  *   - attributes: HTML attributes for the menu item.  *   - below: The menu item child items.  *   - title: The menu link title.  *   - url: The menu link url, instance of \Drupal\Core\Url  *   - localized_options: Menu link localized options.  *   - is_expanded: TRUE if the link has visible children within the current  *     menu tree.  *   - is_collapsed: TRUE if the link has children within the current menu tree  *     that are not currently visible.  *   - in_active_trail: TRUE if the link is in the active trail.  */ #} {% import _self as menus %} {#   We call a macro which calls itself to render the full tree.   @see http://twig.sensiolabs.org/doc/tags/macro.html #} {{ menus.menu_links(items, attributes, 0) }} {% macro menu_links(item