This article explains how to replace the native search bar in the Divi theme by Elegant Themes.
FiboSearch plugin has built-in integration with the Divi theme. It means you can replace the default search bars by selecting a single checkbox.
If you have activated Divi theme or Divi child-theme, you should see the following screen in the plugin settings:
WooCommerce -> FiboSearch -> Starting (tab)
Select the option “Replace all Divi search bars with the FiboSearch.” and the search bar should be replaced.