Click the Tangify button to smooth the connection between the selected circuits that are below a specified angle. This provides a smoother cutting transition between arcs. 

The angle of tangification is specified in the Tangify field. The default setting is 6 degrees.

Select the object you want to tangify. 

Specify the desired angle in the Tangify field. Any selected angles below this value will be made tangent.

Click the Tangify button.

The connection between the selected arcs/curves will now be made tangent.

Because that the above example may be difficult to see, I've created an exaggerated example to illustrate the process. Select the object you want to tangify.

Enter the desired Tangify angle in the Tangify field.

Click the Tangify button.

The transition between the two curves are tangified to make the cutting smoother between them.

Optionally, select Edit>Tangify All Circuits. 

This will tangify all of the circuits in the entire design.