Returns true if the Layout Group controls the heights of its children. Returns false if children control their own heights.
If set to false, the layout group will only affect the positions of the children while leaving the heights untouched. The heights of the children can be set via the respective RectTransforms in this case.
If set to true, the heights of the children are automatically driven by the layout group according to their respective minimum, preferred, and flexible heights. This is useful if the heights of the children should change depending on how much space is available. In this case the height of each child cannot be set manually in the RectTransform, but the minimum, preferred and flexible height for each child can be controlled by adding a LayoutElement component to it.
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