Show menu of parent site in all multiple sites

gistfile1.txt

// All sub-site drop down display
if (!function_exists('get_all_multisite_links')) {
	function get_all_multisite_links($menu_name = 'Primary')
	{
		global $blog_id;
		$current_blog_id = $blog_id; // Get current blog id
		switch_to_blog(1);			// change blog to 'parent site' (ID = 1)
		$primaryNav = wp_get_nav_menu_items($menu_name);
		$menu_object = wp_get_nav_menu_object($menu_name);
		?>
		<h2 class="widget-title mb-3">
			<?php
			echo $menu_object->name;
			?>
		</h2>

		<div class="selectDesti position-relative">
			<select id="select" class="custom-select">
				<?php
				echo '<option value="">--' . $menu_object->name . '--</option>';
				foreach ($primaryNav as $navItem) { ?>

					<option value="<?php echo $navItem->url; ?>"><?php echo $navItem->title; ?></option>
				<?php }
				switch_to_blog($current_blog_id); // re-assign current blog value
				?>
			</select>
		</div>
		<script>
			jQuery(document).ready(function() {
				jQuery('#select').change(function() {
					location.href = jQuery(this).val();
				});
			});
		</script>
	<?php
	}
}