By default, the Search module searches all post types on your site: pages, posts, and any custom post types that exist. You can limit the search to specific post types with some custom code. For example, you could search to the WooCommerce product post type only.
The code varies according to whether or not AJAX is enabled on your site.
Set a filter that uses fl_builder_loop_query_args to specify which post types are allowed in search.
In the following code example,
product are specified in the array as the post types to search. Add your code to functions.php in your child theme.
The code affects all Search modules on your site.
If AJAX is disabled, use
pre_get_posts instead. See this WordPress documentation.