🙂 Hi Helen.
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According to Google, it means: The fact that this grade item is hidden is controlled by the activity settings.
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"hide the exam from the Gradebook setup page by selecting Hide in the actions dropdown menu" doesn't work because "Hide" doesn't appear. All activities show "hide" options except exam activity.
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I was looking for "activity settings" in exam activity configuration (Site administration),
I was looking directly in the activity
I was looking even under the bed