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Here is a guide on how to delete a module?
If necessary, you an delete a module in your course. Deleting a module also deletes all associated module items.
When you delete a module, all of the items in that module are removed, but they are not deleted from the course.
Open Modules
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In Course Navigation, click the Modules link.
Delete Module
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Click the Options icon [1]. Select the Delete link [2].
Confirm Deletion
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Click the OK button.