Note: You are currently viewing documentation for Moodle 1.9. Up-to-date documentation for the latest stable version is available here: Module security.
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.