Firstly, the General Blog Options are located at Avada > Theme Options > Blog > General Blog, from the WordPress dashboard.
As noted at the top of the page: “The options on this tab only control the assigned blog page in “Settings > Reading”, blog archives or the blog single post page, not the blog element. The only options on this tab that work with the blog element are the Date Format options and Load More Post Button Color.”
Archive pages are the automatically generated pages you get when you click on a Category, or Tag on the front end. These archive pages display according to the options chosen here. See the Blog Archive Pages documentation for more information on this.