Place html or widgets inside sticky menu nav bar?

You're probably better off disabling the navigation search and hooking your HTML into the navigation like this:

add_action( 'generate_inside_navigation','generate_insert_into_navigation' );
function generate_insert_into_navigation()
{ ?>
      Put your HTML or whatever in here
<?php }

You'll have to put your search code in a div with a class so you can target it with CSS to position it, but this should get you started :)

Adding PHP: https://generatepress.com/knowledgebase/adding-php-functions/

Thanks! That´s perfect! :)

No problem! :)

Hmm.. I was a bit too fast there.... Nothing shows up in the nav bar when I put in the code above. :/

Can you link me to your site? :)

Here you go: http://www.fysionett.no

I´ve used a plugin called code snippets to add the code you supplied above and pasted in the code for the search box.

I gave it a class called "sok" , which means search in my language. However I haven't positioned it with css yet. But still nothing shows up anywhere...

Ah, I made a mistake in the code snippet above.

Re-paste it and you should be good to go :)

It´s working now. Thank you! :)

You're welcome :)