Show Primary Nav after the Header created with Elements

Hi.

I created one header with Appearance >> Elements for the entire site.

Now I am trying to move the Primary Menu below the header. I simply can't do that ...

I found a similar topic, but this is not wiorking for me:
https://generatepress.com/forums/topic/move-navigation-to-the-bottom-of-the-header/

Any ideas?

Thanks in advance.

Beste regards!