There are several different types of visibility for reviews and star ratings, depending on your preferences.
Hiding reviews from workers: When enabled, will not show the text reviews to a worker
Hiding star ratings from workers: When enabled, will not show the worker their actual star rating. This includes both their overall star rating and the star rating that they receive on each shift worked.
Hide star ratings from other admins: When enabled, only the owner will be able to see star ratings. It is possible for another admin, however, to reverse this option and see their own (or others) star rating if they have Configurator permissions assigned in their profile.