add_filter( 'wpex_header_classes', function( $classes ) {
// This will hide your entire header at the mobile menu breakpoint which is 959px by default
// and can be changed under Customize > Header > Mobile Menu
$classes[] = 'hide-at-mm-breakpoint';
// Return classes
return $classes;
} );
Snippets: Hide Header on Mobile via PHP
All PHP snippets should be added via a child theme's functions.php file or via the Code Snippets Plugin (or alternative plugin)