Many parts of the widget can have rounded or square corners, but the top-level box should have the same option to square or round its edges
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Hi there @Jonathan_Hill 
If you want to change the corner radius of the header, you can do this in the Header section on the Style tab:
In case, you’d like to change corner radius of the Write a Review button, you can do this in the Write a Review button section:
However, if I misunderstood you and it’s not what you are looking for, please describe your case in more detail. I’ll gladly check things for you 