New question :
I have seen that I can customize the header of each page by choosing between “inherit, base header, e-commerce, etc.” in each page parameters.
BUT, it only changes the location of each part of the header : logo, menu, widgets.
I would like to customize the background color, the font color, change the color of my logo (different image)… Is it possible an d how can I do that ?
At the moment you are able to see all settings for each page in “Page Setting (custom metabox from theme)” area. Unfortunately, it is not possible to place all options from Theme Settings to this metabox. So if you need you can add some custom styles to custom CSS box in Visual Composer for this page to change other options like header background and navigation font.