How rating calculation works
When users submit reviews for a listing a rating is automatically calculated for the listing based on all the reviews submitted. Rating calculation can work in two ways. The behaviour of the calculation can be selected in Settings → Posterno → Reviews → Rating behaviour
Dedicated overall rating field for the review
A dedicated stars selection field is used as the overall rating for the review. If you've added labels, they won't be taken in consideration when calculating the rating of a review.
Automatically calculate overall rating from labels
When enabled, labels can be used to calculate the overall rating of a review. The "how would you rate your experience?" field is hidden. This calculation method should only be enabled when you have at least 2 rating labels.
When submitting a review, the value of all labels is taken in consideration and an average value is calculated and used as the overall rating for the review.