Hi Bjorn,

Thank you for your message.

This height can be decreased by copy/paste the following CSS to Appearance -> Customize -> Additional CSS:

/* decrease theme header height */
@media (min-width: 992px) {
    .header .header-wrapper .header-logo {
    	height: 113px;
    }
    .main-navigation > li > a {
    	line-height: 28px;
    }
}

The 113px and 28px can be decreased to your own likings.

Hope this helps, let me know if you have any questions!

You're welcome! :)

If you have any other questions please let me know.

Thanks, you too!