Where can I change the subheadline of the main menu?

I’m using the main menu on the left side.

The demo importer brought me a cool main menu with a nice subheadline (short description) but if I ad new pages to the menu, then there is no option to add a subheadline. WHERE to find and edit the subheadlines?

The enfold options says the left menu is working with sidebars and can be edited in whidges area but there is no “menu” in the widgets section. The menu is just in the menu section.

please help !!!!!!!!!