Hello!
That’s a really great question. Normally the primary menu at the top is meant to collapse into the “Hamburger” on mobile devices, but if you’re only using the one item- your phone number- I can definitely see why you’d want to disable this behavior.
I came up with one solution, assuming the menu you’re using for your phone number is the Primary Menu. You can tell if you’re using the Primary Menu in the Customize -> Menus -> Menu Locations section. If you’re using another menu, replace “primary-navbar” in the code below with the corresponding menu name you’re using for your phone number.
This is going to take both custom CSS, and custom JavaScript, so head over to your Customize -> Advanced -> Custom JS & CSS menu.
For your CSS, use this code:
.navbar-toggle {
display: none;
}
Then, for your custom JavaScript, use this code:
document.getElementById("primary-navbar").classList.remove("collapse");
document.getElementById("primary-navbar").classList.remove("navbar-collapse");
I hope this helps!