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_Project/Assets/Editor/ActiveToggle.cs

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+using UnityEditor;
+using UnityEngine;
+
+public static class ActiveToggle
+{
+    private const int WIDTH = 16;
+
+    [InitializeOnLoadMethod]
+    private static void Example()
+    {
+        EditorApplication.hierarchyWindowItemOnGUI += OnGUI;
+    }
+
+    private static void OnGUI(int instanceID, Rect selectionRect)
+    {
+        var go = EditorUtility.InstanceIDToObject(instanceID) as GameObject;
+
+        if (go == null)
+        {
+            return;
+        }
+
+        var pos = selectionRect;
+        pos.x = pos.xMax - WIDTH;
+        pos.width = WIDTH;
+
+        var newActive = GUI.Toggle(pos, go.activeSelf, string.Empty);
+
+        if (newActive == go.activeSelf)
+        {
+            return;
+        }
+
+        go.SetActive(newActive);
+    }
+}