How to Customize Top Menu
You can add a top menu, see here.
Add an icon into menu link:
Access to Appearance Menus, click “Screen Options” button in the top right.
Then check “CSS Classes”
Then input an icon class
Display:
Click here to see 200 icons.
Add sub dropdown divider:
Add a divider link to menu
Then type “divider” class into “CSS Classes” input form.
Add sub dropdown header:
Add a header link to menu
Then type “dropdown-header” class into “CSS Classes” input form.
Display: