Starting from version 1.13.0, FiboSearch Pro is integrated with the Custom Product Tabs for WooCommerce by YIKES plugin.
To enable searching in custom tabs, go to WooCommerce → FiboSearch → Search config (tab)→ select the [Custom Product Tabs for WooCommerce] tab content in the “Search in custom fields” section:
Save the settings. After the index is rebuilt, you’ll be able to search in custom tabs.