Currently, the term "Availability" is being used to describe the options "Show on course page", "Hide on course page" and "Make available, but don't show on course page".

This term is being used in another context which is the availability of an activity (for example mod_assign) which describes *when* an activity is available for a user depending on dates, but not influencing the visibility of this activity instance.

Therefore, I suggest to use "Visibility" instead of "Availability" in the course activity action menu to make it easier for the user to distinguish.

Based on the feedback I will be happy to provide a patch for this.