How to move a brush adjustment mask (used to be able to click the dot and drag it wherever you want)

I used to be able to copy a mask to a new image and then drag it into position by clicking the dot at the origin point and then clicking it again and dragging it wherever I want.  In a recent update the dot became a brush, but now I don't even see that, so either they've updated it right out of the system, or I've turned it off somehow and I don't know how to get it back, nor does a search reveal this information.  Any help?  Thanks.