Menu items do not “open” when mouse hover over them?

You Can Add This css In style.css or WordPress Admin panel Option : Appearance > Customize > Additional CSS and Save css

#nav .menu li:hover > ul.sub-menu {
    display: block !important;
    visibility: unset !important;
}

enter image description here

Related Posts:

  1. Any docs for wp_nav_menu’s “items_wrap” argument?
  2. Does Extending Multiple Nav_Menu_Walkers Allow Nested Menus?
  3. Bootstrap dropdown nav pills not working with wp_nav_menu()
  4. Show child pages by menu order using Superfish Dropdown menu?
  5. Bootstrap drop down menu with wp_nav_menu
  6. How do I give class to the dropdown sub-menu in the wp_nav_menu?
  7. How to Create a Custom WordPress Navigation Menu with the Code?
  8. WordPress 3.5 dropdown menu
  9. Menu item with no page, but with dropdown
  10. Add css class to dropdown
  11. Using a shortcode to create a dropdown menu from wp_nav_menu list items
  12. Menu in left side don’t appears with dropdown
  13. getting the current sub item out of total sub items in a given dropdown (custom walker)
  14. How to add html attributes to the “ul” html tag with “wp_nav_menu” function?
  15. How to remove dropdown from wp_nav_menu
  16. styling wp_nav_menu – horizontal, sub-menu drop downs
  17. Replace the slug of parent pages with # [closed]
  18. wp_get_archives doesn’t take effect from css or html
  19. Adding archive years to my menu
  20. Nav menu classes ‘has-dropdown’ but no ‘active’
  21. Drop Down menu expanded by default (on front page) [closed]
  22. Custom menu – different submenu for first menu item
  23. dropdown menu, with walker
  24. Dropdown primary navigation menu not working
  25. Is there any way to change the CSS class applied to 2nd level sub menu ul’s?
  26. WordPress menu issue – if there are child links partents won’t click
  27. How can I create this menu with wp_nav_menu()?
  28. Responsive Dropdown Menu
  29. Foundation Scripts not loading (custom theme)
  30. Reveal hidden submenus on page load – Twenty Fifteen theme
  31. No indication of menu
  32. wp_dropdown_nav function to list menu items
  33. How to make a drop down menu with categories
  34. How to add an tag when a menu item is a dropdown(or has a sub-menu) [duplicate]
  35. How to add posts with thumbnails to my dropdown menu?
  36. Should I custom code drop down menus or use a wordpress plugin?
  37. Keeping my Sub Menu open when hovering on its list items
  38. Jquery dropdown menus working locally, but not in WordPress [duplicate]
  39. Add a page to a subscribers account
  40. What is the best way to incorporate responsive dropdown navigation menu into custom theme?
  41. Icon not shown in Dropdown menus in Twenty Seventeen Theme
  42. Add Javascript to WordPress Menu
  43. Add custom menu item using wp_nav_menu_items filter
  44. register_nav_menus() won’t register menus
  45. How to include the ‘current-menu-ancestor’ class on a custom post type menu in WordPress?
  46. HTML Bootstrap navigation menu to WordPress menu using wp_nav_menu
  47. Getting URL value from menu item by ID
  48. Adding a class (arrows) to main menu links that have children?
  49. Is it possible to add a filter for the output of nav-menu items in admin?
  50. Adding html elements to wp nav menu
  51. How to change menu according to the language?
  52. add_action for saving a custom menu
  53. Getting post content within wp_nav_walker
  54. Nav Walker current menu item not displaying
  55. Navigation (wp_nav_menu) refuses to nest within parent element
  56. Recreating the hierarchy of taxonomies for a dropdown form menu?
  57. Wp_Nav_Menu – Identify the last menu item
  58. Add custom menu item metabox in Navigation Settings
  59. Populating main menu from external JSON API
  60. HTML in Menu Items disappear on save
  61. How to put a Menu on the left side of a particular page in WordPress 3.5
  62. How do you cope with the task of adding hierarchy to the navigation menu?
  63. Why do menus break on site url and folder change?
  64. Restrict control in nav-menu for specific role
  65. walker – 0 level on submenu formatting
  66. Translate a word in a responsive menu
  67. Remove nav menu item by script
  68. Custom Menu Broken WP 3.8.1 Update
  69. How to I know the class or ID of my theme?
  70. Adding sub-menu item makes parent item unclickable
  71. Reverse the order of and in a wp_nav_menu
  72. Missunderstanding of WordPress menus
  73. How to add schema.org SiteNavigationElement and property URL to navbar?
  74. Get custom classes in WordPress Navigation Menu
  75. wp_nav_menu: Is there a way to modify the output of that got a submenu?
  76. How can I create a new menu item that links to an archive of a custom post type?
  77. Make two bootstrap menus collapse into one dropdown
  78. How can I list the current pages siblings and any ancestor page siblings?
  79. Show menu only if_page is
  80. WordPress Menus – How to add inline styles to UL menus
  81. custom menu widget where menu title is a link
  82. removing the list container from the custom menu output
  83. WordPress website – Mobile menu behavior help
  84. Custom menu items in admin
  85. WordPress Accessible Keyboard Menus
  86. mysterious menu
  87. Importing large product categories into wordpress menu
  88. Different HTML markup for similar menus
  89. Custom wordpress submenu
  90. Why does appear? I’m trying to remove a generic link called navigation on my main menu
  91. Show more menu items to registered members
  92. WordPress menus – automatically generate
  93. Add a Submenu from Another Submenu in a Custom Theme
  94. Give a condition to a wordpress menu item to change its offerid for each landing page I create
  95. Menu id in nav menu ignored
  96. Bootstrap 3 and WordPress menu navigation menu highlighting
  97. Show different menus for login / logout user [closed]
  98. creating a left-side sidebar in word press [closed]
  99. Displaying list of random links using wp_nav_menu
  100. Add featured posts to nav menu