How to reset height of the green boundary in 2dPlatformer?

Unity Engine
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1

I would like to know how to reset the height of the green boundary area of 2dPlatformer.

Which game object, script and variable that I can edit it?

389540--13404--$screen_shot_2010_09_19_at_52245_pm_174.png

2

got it, it is in Level Attributes → Bounds → Height