Master slide layer connected to Feedback master layout. Why?

I have a slide master that I want to add a layer to. I View > Slidemaster and pick the layout I want to adjust.

I click the New Layer button and, indeed, get a new layer.

However the layer has a transparent grey tint. Just like the background on the Feedback Masters. (I'm not actually using the feedback masters, but they are there.) And in fact if I go to the Feedback masters and turn off that transparent grey background it goes away from my newly created layer.

First question: Why is a new layer tied to Feedback masters? That just doesn't seem right at all!

Second question: How can I change what it is tied to? or break that connection.

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