How do I stop Squarespace from hiding my navigation links and social icons behind a hamburger menu?

I want my header to be effectively the same on mobile and desktop, the only difference being that the content (Title/Logo, Navigation, Social Links) would be stacked due to the width of the screen.

How on earth do I make this happen? I cannot stand the hamburger menu, as not every potential client is going to be computer literate enough to know what it is or how to open it. If visitors can't see the link, it might as well not be there.

I want my navigation links to be plainly visible as soon as they reach the website.