How to enable this dropdown menu in Edition Theme?

[JLL]

I love this dropdown menu in the Edition Theme. However, I do not know how to enable this dropdown menu.

Can someone teach me how to do it? Thanks.

[denvergeeks]

In the admin panel of your Ghost site, in Settings > Navigation

The first five menu items populate the first 5 (individual) links.

After the first 5, all the rest will populate the dropdown . . .