Solved How to make logo display on sticky nav? (style 6)

You can't do that. You can only make a row / section to be sticky. There are 2 alternative:

1. Make the whole header sticky, by adding free-sticky CSS class to the header section.

2. Use the default Divi header on scroll, which will have the logo inline with your sticky menu. To do this, there are several steps to do:

• First, remove the free-sticky CSS from the menu row settings.
• Next, add this custom CSS to show the default Divi header in desktop: #main-header, #top-header { display: block!important; }
• Lastly, you just need to go to Theme Customizer -> Header & Navigation -> Header Format -> Enable Hide Navigation Until Scroll.
• And done.