The code below should be placed in the filter_functions.php
file in overrides per the JReviews Hooks documentation.
This is meant to be a starting point, not a full-proof solution as JReviews itself doesn't have functionality to limit visibility of user generated content.
// Listing list pages
// https://www.jreviews.com/docs/hooks/pre_get_listings_listpage_query
// https://www.jreviews.com/docs/hooks/pre_get_listings_listings_module_query
function limit_listing_list_visibility_to_owners_and_admins($ListingsRepository, $params)