Just picking up on this thread, i have the same issue of space below the header and the next element, which in this case is an image slider.
Using GPPro and Elementor, i have inserted the Elementor header shortcode in to the ‘After Header’ GP Hook but i am getting the gap between elements.
I have tried the above recommended fix ‘Check Customizer > Layout > Container > Top Content Padding’ but i don’t have the ‘Top Content Padding’ option.
Any ideas? The site can be viewed at http://sekoya.konstructstudios.co.uk/