To display the reviews on product pages, you must add the “Woo Product Reviews” module or “Woo Product Tabs” module to the product layout.

If the reviews are not getting displayed on the front-end, make sure you have the reviews are enabled, to do that:

1- Go to your admin dashboard -> WooCommerce -> Settings -> Products tab -> Enable reviews.

 

2- Also, make sure that the reviews are enabled for individual products, to do that, go to your admin dashboard -> Products -> under each product -> Quick edit -> Enable Reviews.