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) and select
[Custom Product Tabs for WooCommerce] Tab(s) 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.