ScriptReference/GameObject-activeInHierarchy

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ScriptReference/GameObject-activeInHierarchy

https://docs.unity3d.com/ScriptReference/GameObject-activeInHierarchy.html

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Note that this will return false if used on an uninstantiated prefab (for example if you're writing an editor tool that requires selecting a prefab in the project window).
For example, this will always be false when a prefab is selected in the Project window:

Selection.activeGameObject.activeInHierarchy