You can choose the headers while creating your Pages. Simply follow the structure below to create the header:
<!-- Start Header -->
<header id="top-navbar" class="top-navbar">
....
</header>
<!-- End Header -->
Mobile Menu Styles
<!-- Mobile side Menu -->
<div class="menu">
<div>
<nav>
.....
</nav>
</div>
</div>
<!-- Mobile Side Menu End -->