Where does the icons for vertical_multilevel_menu items come from?

Question

1C-Bitrix

Hello. There is a vertical_multilevel_menu, for menu items (for main sections, not for elements) you need to set icons. I can't figure out where they should come from. I found all the files related to this menu.
Thanks in advance for your replies.

Answer 1

I myself have not met with such a menu, but I think that it is written in CSS classes, look there, and I think you will find it.