Some sections of the page are not editable directly in Avada Live, in the same way, they are not editable in the back-end builder. These areas are not coming from the builder, and are controlled from the Global Options, or other areas in WordPress.
These are areas like the Header, the Menu, the Logo, the Sliders, the Page Title Bar, the Sidebars, the Sliding Bar, and the Footer. You can identify these areas most easily by toggling the Wireframe icon on the top Toolbar. The sections that are not in the Wireframe are outside of page content.
In Avada Live, if you mouse over one of these areas, you will see a Control Bar with icons, and clicking the various icons takes you directly to the relevant section of WordPress, in a new tab, or the Global Options, in the Sidebar Panel. Depending on the icon, and what the default settings are, these may be global or local options. In the Header Control Bar, for example, there is a shortcut to the Header Layout, the Logo, and the Main Menu (all global), as well as an Add Slider Icon if there is no slider on the page (local option), and an Add Page Title Bar Icon (again, only if there is no Page Title Bar already on the page and this Icon is local or global depending on default settings).
If your site has a Custom Header Layout, then instead, there will be a single icon to enable you to edit the active Header Layout Section directly from the page. This will be the same for Page Title Bars, and Footers.