Sub-menu in Full Width Area code revision

hello,

Been following a thread where Ismael writes code which places into Functions for theme, adding in Full Width Submenu:

https://kriesi.at/support/topic/adding-full-width-submenu-to-post-template/

So far I only change “if( is_singular(‘post’) ) {” to “if( is_singular(‘page’) ) {” to work for my Pages instead of Posts. So far so good!

Like to please know how to target the correct Menu from Appearance > Menus as it’s showing a random test menu I created, and where to modify specifically to below code?

Also why are the menu items listed out here.. does it not just use the menu structure from Appearance>Menus?
i.e…
[av_submenu_item title='Treatments' link='manually,http://' linktarget='' button_style='']

add_action('wp_footer', 'ava_after_main_title_mod');
function ava_after_main_title_mod() {
	if( is_singular('page') ) {
	echo "
<div id='custom-fullwidth'>";
	echo do_shortcode("[av_submenu which_menu='' menu='4' position='center' color='main_color' sticky='aviaTBsticky' mobile='disabled']
	[av_submenu_item title='Treatments' link='manually,http://' linktarget='' button_style='']
	[av_submenu_item title='Spa Days' link='manually,http://' linktarget='' button_style='']
	[av_submenu_item title='Fitness' link='manually,http://' linktarget='' button_style='']
	[av_submenu_item title='Fashion' link='manually,http://' linktarget='' button_style='']
	[av_submenu_item title='Health' link='manually,http://' linktarget='' button_style='']
	[av_submenu_item title='Special offers' link='manually,http://' linktarget='' button_style='']
	[/av_submenu]");
	echo "</div>
";
}
}

function ava_custom_script_mod_submenu(){
?>
<script>
(function($){
	$('#custom-fullwidth').next('.clear').appendTo('#custom-fullwidth');
	$('#custom-fullwidth').next('.av-submenu-container').appendTo('#custom-fullwidth');
	$('#custom-fullwidth').next('.sticky_placeholder').appendTo('#custom-fullwidth');
	$('#custom-fullwidth').prependTo('#main');
	$('#custom-fullwidth').prependTo('#main');
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'ava_custom_script_mod_submenu');

Thanks!