top menu does not show on mobile

Hi, I have installed Customizr version 4.4.21 on a new website still under construction. I have setup a classical navigation menu and added one top left menu : I just checked how it look in a mobile (with the Ctrl+Shift+m keys in Firefox), and the top left menu isn’t showing.
Is there a way to make it available on the landing page even in a mobile or a tablet? Eventually does the pro version provide such a feature? (pro version whose demo I have visited before asking ?? )
Thanks for your help!