Hi Carsten Andersen
Thanks for contacting us.
You can use the below plugin to display the menu on the top header.
So please install and activate the menu plugin https://wordpress.org/plugins/groovy-menu-free/.
And please replace the below link code in consultstreet-pro >> template-parts >> site-header.php file.
https://pastebin.com/7s7V25yA
Let us know if it works.
Thanks