After installation, I’m having issues with Theme options and main navigation menu.
- When I go to the theme options sections, the page takes ages to display and when it displays, I do not have the four tabs as seen in the documentation (Main, Main navigation, Subheader, Transparent Header). Instead, all these sections are on the same page, one after each other. And some settings are not available, like for example I can’t enter any values in “sticky header background color” or “Transparent Header Main Navigation Hover Text Color”. Maybe something went wrong with the installation, I had to do it a second time after changing my server ressources.
- The second thing I try to do is set the header as your demo (http://preview.themeforest.net/item/fortuna-responsive-multipurpose-wordpress-theme/full_screen_preview/12496833), which means with logo on left-hand side and menu at the right.
Thanks a lot for your help!

I think something is wrong with your HTTPS settings, check your JS console.
Make sure you fix that with your administrator and go on then.
As for setting your header to be full width, it’s a simple CSS you can add to either your Theme options -> Custom css or your child theme’s CSS file:

#header .container {
    width: 90%;
}
.container.mega_menu_holder {
    width: 100% !important;
}

Thanks