Source code for https://victorfont.com/genesis-move-primary-nav-header-structural-wrap/

move-primary-nav-header-structural-wrap.php

<?php

remove_action( 'genesis_after_header', 'genesis_do_nav' );
remove_action( 'genesis_header', 'genesis_header_markup_close', 15 );
add_action('genesis_header', 'add_nav_after_structural_wrap', 15);

function add_nav_after_structural_wrap() {

	genesis_structural_wrap( 'header', 'close' );
	genesis_markup( array(
		'close'   => genesis_do_nav() . '</header>',
		'context' => 'site-header',
	) );

}