commodorevic

Thanks for your response, Neal007. That snippet of code had no effect on the layout.

This is the header.php code:

<!-- SITE HEADER -->

	<header class="site-header navbar row clearfix">

		<div class="navbar-header">
			<button class="navbar-toggle collapsed" type="button"
			data-toggle="collapse" data-target="#main-menu"
			aria-controls="main-menu" aria-expanded="false">
				<span class="sr-only">Toggle navigation</span>
				<span><span class="glyphicon glyphicon-menu-hamburger"></span><strong>MENU</strong></span>
			</button>
			<h1>
			<a href="<?php bloginfo( 'url' ); ?>" class="navbar-brand"></a>
			<?php bloginfo('name'); ?>
			</h1>
		</div> <!-- .navbar-header -->

		<?php
			wp_nav_menu( array(
				'menu'				=>	'primary-menu',
				'theme_location'	=>	'primary-menu',
				'depth'				=>	2,
				'container'			=>	'nav',
				'container_class'	=>	'main-menu collapse navbar-collapse right',
				'container_id'		=>	'main-menu',
				'menu_class'		=>	'nav navbar-nav',
				'fallback_cb'		=>	'wp_bootstrap_navwalker::fallback',
				'walker'			=>	new wp_bootstrap_navwalker())
			);
		?>

	</header> <!-- .site-header -->