Fillet tool is used to create a round corner.
Preview:

Note: Fillet feature seems available starting from X3 version. CMIIW
How To
1. Create a random polygon for practice.

2. Click on Shape Tool (F10).

3. Select object. Select nodes you want to fillet. Use click n drag or with shift button to select multiple nodes.

4. Go to Window menu –> Dockers –> Fillet/Scallop/Chamfer

5. A new docker will be shown on the right window.
Choose Operation: Fillet. Insert the Radius value. Click Apply.

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