menu

Drupal 8 System Link Menu

system.admin:
  title: Administration
  route_name: system.admin
  weight: 9
  menu_name: admin
system.admin_content:

Bootstrap theme menu hover and clickable parent menu

This article show you how config Drupal Bootstrap theme allow show dropdown menu when hover and clickable parent menu

First add this css to your theme css, usually is style.css

@media (min-width: 768px) {
  .dropdown:hover .dropdown-menu {
    display: block;
  }
}

Second, override theme_menu_link to remove data-toggle