By default, FiboFilters doesn’t index private products. However, you can use the following hook to show these products to administrators, shop managers and other privileged users:
add_filter( 'fibofilters/show_private_products_to_privileged_users', fn() => true );
ⓘLearn how to add this snippet to your WordPress.
After adding the code, go to WooCommerce > FiboFilters > Indexer and rebuild the index.