Is there a way to protect part of the image using Control Points?

Some of the other Nik applications have negative Control Points but I don’t see that in Silver Efex Pro.
I’m on Windows 10.

Many thanks.

After I posted I realized that creating a new Control Point will protect an area. Is that correct?

this is correct

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A negative CP is merely a CP with 0% opacity. Set a CP on an area that you wish to protect, set it’s opacity to 0% then adjust the radius according to the needs of your image.

Got it. Thanks.

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