Changing master slide background color

Storyline 360 background style doesn't work as expected.   In Master slide view when I change the background color it affects only the color of shapes in a slide and not the slide background, which remains white. I also tried some of the ready-made styles and same thing happened (or, didn't happen).

Is this a bug or am I missing something?  Is it possible to change the color of the background (short of drawing a shape with the color I want to cover the background)?

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