The background behind Overlay don't work?

The background behind Overlay on the first window is 100%, after pressing the button the second Overlay should open with Background behind Overlay 0% (it does not cover the entire screen, only most of the screen). But when playing the second overlay, I see the Background behind Overlay of the first overlay, so the prototype doesn’t look how I want it to. Why does the double overlay have the Background behind the first overlay? How can I fix it? What should I do to make the settings of the second overlay work? Why is it so inconveniently done? Please help me with advice.