Hi Long, thanks so much for your help. Much appreciated.
I noticed that within the archive view, for render "Only the post content area" it does not show the featured image. Actually, none of my settings are applied. It seems completely ignored.
For render "The layout between header and footer" the featured image is shown, but after the theme's header image, not replacing it.
I am not a real developer, so I prefer to stick as close as possible the the theme, hence using render "Only the post content area". But how to have my view settings applied, as well as the featured image replacing the theme's header image?
I hope you can help me further.