After approving, hiding, or featuring your reviews you will have the ability to change the order they will appear within the widget.
See the below example which shows how to rearrange the order of the Approved Reviews.
1) Start by using the View tab to select either an Approved or Featured review.
2) Using the arrow buttons you will be able to change the order of the reviews.
The double up arrows will cause the review to be moved to the very top and be viewed first by users.
The single up arrow will cause the review to be moved up once.
The single down arrow will cause the review to be moved down once.
And the double down arrows will cause the review to be moved to the very bottom, making it one of the last reviews a user will be able to view.