Module security
From MoodleDocs
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Location: Administration > Security > Module security (only in Moodle 1.7 onwards)
Certain activity modules may be disabled so that they do not appear in the "Add an activity" drop-down menu for teachers. The setting only applies to teachers - administrators are always able to add any activity to a course.
To disable an activity module completely, click the eye icon in the hide/show column in Administration > Modules > Activities.
