Thank you for you reply!
I'm using the 5.5 for my customization. But I'm talking about "Editorial team" menu item which is rendered by system itself and it can't be commented in navbar template(as "Search" and "Announcements" items). So it still is showing up.
In "Masthead" I' don't have any people enrolled, only super admin is registered in system. I chose the "The Journal Manager creates titles and adds people under each title." option -> "Editorial team" menu item show up and is empty. Can't hide it with CSS, because it doesn't have unique ID.
So, I can't find any solution