Secondary Navigation Menu Before Header

Hi,
I’m trying to add a secondary navigation menu to the top of a website (before the header) using the instructions in this post https://generatepress.com/forums/topic/i-want-to-have-a-second-menu-on-certain-pages-what-is-the-best-way/, and I’m not able to make it work. I have added it as a Hook Element using the generate_before_header with a priority of 15. Under Display Rules, I have chosen Entire Site.

Again, I’m using this code as suggested in the post:

<div class="second-nav">
	<?php 
	if ( function_exists( 'generate_secondary_navigation_position' ) ) {
		generate_secondary_navigation_position();
	}
	?>	
</div>

As you can see, the menu appears twice. Can you tell me what I’m doing wrong? Also, is there a way to align that secondary menu to the left before the header?