Automatic integration is the default method for enabling Max Mega Menu on an existing theme menu location.
This method will automatically override your default theme menu and replace it with a Max Mega Menu menu.
To use Automatic Integration go to Mega Menu > Menu Locations and use the toggle to enable Max Mega Menu for the theme menu location you wish to convert into a Mega Menu. (Make sure a menu is assigned to that location under Appearance > Menus.)

For Automatic Integration to work your theme must use the wp_nav_menu() function to output the menu on your site, and it must also specify the ‘theme_location’ parameter. The vast majority of themes use this method to output menus.
If your theme does not use wp_nav_menu() to output the menu then you can use the Block, Shortcode, Widget or PHP method to output the menu instead.