We have styled specific classes to allow the user to create beautiful menus directly from the dashboard. These classes are listed below, along with relevant examples.
– hestia-mega-menu – this class acts as a wrapper for the mega-menu.
– hestia-mm-col – this class is a wrapper for the columns of the menu. The contents are not shown, this is just a wrapper.
– hestia-mm-heading – styles the item as a heading. The contents are shown and can also have a link.
We also have an element called divider. You can insert one between your menu items by simply adding a menu item with a link value of # and with the title divider, and the CSS class divider.
Link descriptions also show up. So anything you insert in the Description field of the menu item will be shown right below it.
From: https://docs.themeisle.com/article/704-hestia-basic-mega-menu-setup