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AutoExpandCategories

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Specifies one or more categories that should be automatically expanded in the Unreal Editor property window for objects of this class. To auto-expand variables declared with no category, use the name of the class which declares the variable.

UCLASS(autoexpandcategories=PostProcessVolume)
class APostProcessVolume : public AVolume
{
    ...
}

AutoExpandCategories=(Category, Category, ...)