How to update Header and Footer:
- Log in to your WP Admin panel.
- Navigate to Divi > Theme Builder.
- Edit global Header or global Footer > Save changes.
How to revert back to Default Header and Footer options:
- If you want use demo header go to Divi > Theme Builder > Delete Header or Footer
2. Now you can use Divi Header Options.
Go to Appearance > Customize > Header & Navigation > Header Format
Here you can adjust your header’s general format, such as switching between the main layouts modes: Default, Centered, Centered Inline Logo, Slide-in, and Fullscreen.
Choosing Centered will place your logo above your navigation menu and centered both within the header.
Choosing Centered Inline Logo will place the logo in-line with your nav menu elements, centered between the links.
You can also enable Vertical Navigation from within this section, which will create a drastically new look for your site, putting the navigation bar on the left of your content
Need More Tutorials:
How to Setup Menus: https://codex.wordpress.org/WordPress_Menu_User_Guide
Divi Builder overiew: https://www.elegantthemes.com/documentation/divi/visual-builder/