You can add 'See all reviews' button to Reviews Widget on product page. When clicked, customers will be directed to a dedicated reviews page to see all reviews of your store.
You must create a dedicated reviews page first.
Learn about how to create a dedicated reviews page here.
From Reviews tab,
- Go to Settings → General Settings.
- On Look & Feel tab, enter the URL of your dedicated reviews page on All Reviews Page URL field.
- Click Save.
'See all reviews' button will be automatically enabled when All Reviews Page URL is entered.
If it's not entered, the button will not be enabled.