Why is there a button in the nav menu element that I can't delete?

I’m trying to use the standard nav menu element. When I create it, there’s a “button” element in the nav menu that I can’t delete. I can’t seem to find it on the page. What’s that, and how can I delete it?

Its the button use when you are on mobile.
Its not deletable as it is hard code inside this element.
To see it, just switch to mobile view :slight_smile: