Header 4 makes changes to the logo and menu area. The Header Top section is the same as in the previous Header layout, but below that, the middle section contains the Logo to the left and adds a configurable middle right section to the Header layout. This section is configured via Avada > Options > Header > Header Content > Header Content 3. The possible combinations are: Tagline and Search (default), Search, Tagline, Banner, and Leave Empty. If you choose Tagline and Search, or Tagline you will see another field for setting the tagline, and if you choose Banner, a field for the Banner Code will appear. Both of these fields will be visible at the bottom of the Header Content Theme Options Section when the corresponding option is selected.
The Menu in Header 4 is situated in a bottom section of the Header layout, and is centered by default. There is, however, an option to position the menu alternatively to the left or to the right. This option is found under Avada > Options > Menu> Main Menu Typography > Main Menu Text Align.