It's always centered around 0.
ScrollEd (the level editor embedded in Scroll) uses layers and assumes foreground layers with a Z < 0, gameplay/physics layer with Z = 0, background layers with Z > 0.
That being said, it's the default behavior, one can modify the camera Z position if needed, but knowing how ScrollEd works is then essential (unless not used at all).
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ScrollEd (the level editor embedded in Scroll) uses layers and assumes foreground layers with a Z < 0, gameplay/physics layer with Z = 0, background layers with Z > 0.