When you adjust a color setting in Divi, you will notice a new “Global” tab next to the existing “Saved” and “Recent” color palettes. Opening the global tab will reveal your global color palette, allowing you to manage and apply global colors. Click the plus icon to add a new global color to your palette, or click the gear icon to manage existing colors.

Read more: https://www.elegantthemes.com/blog/theme-releases/divi-global-colors