The change to nested menus
Nested navigation makes it easier to create and arrange drop-down menus because you can see the different levels of your menus in your Shopify admin. You can take a look at the updates to the menu interface on the Navigation page in your Shopify admin. Your menus will stay the same until you decide to make changes.
To facilitate the transition, the previous way of creating drop-down menus will continue to be supported. However, you will need to recreate your drop-down menus as nested menu items to benefit from the new functionalities. If you switch to a theme that supports the
link.links liquid attribute, then you will then need to recreate all of your drop-down menus.