Ci Site Tool allows to create a Curved Boundary in the Site Boundary Editor – select a specific boundary that you need to modify, change the following parameters – Sweep < Arc Radius < Arc Length
Refer screenshot attached as an example for the quick steps.
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For more settings refer to this knowledge base link with a workflow video –
https://cadimage.zendesk.com/hc/en-us/articles/8174847123471-CI-Sites-Tool-Creating-a-Curved-Boundary