Editing main-menu I can not see any options to configure here...?
Υou're right as I haven't mentioned anything on documentation about Mega menu settings.
To be able to enable mega menu on a menu item you have to insert class "mega" on menu item css class attribute. You have to go to Pages plugin -> Menus -> select menu item -> On attribute tab insert "mega" on css class -> Click Apply ->Save main-menu.
If you want to insert animate effects to reveal menu items you just insert animate class from animate.css library. There is a default animation but you can change it if you insert new class with the same way that described. For example you can insert "flipInY" class.
If you want to specify the width of the submenu item of the mega menu you have to insert the bootstrap 4 column class on menu item attributes css class. For example if you need a mega menu with 4 columns you have to insert css class "col-lg-3 col-md-6" on every item attribute css class.
You also have the option to insert banners on mega menus. You first need to create the banner on theme settings header options. Then you have to create a menu item with type "Header" and insert the class "banner1" on atributes css class. You can create maximum 8 banners for your mega menus.
Please let me know if that help you.
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