Toggle off canvas and headroom.js with Gantry

Hi everybody,

I have configured one test site with Gantry and headroom.js, and in the phones or tablets, the mobile menu in off canvas section, is activated, and you can see in the bellow image, that the menu icon (three lines up to the left) is moved with the scroll, not fixed in navigation section.

Does anyone know how this menu can be set in the navigation section?

Thanks.