List of named Collections in Search Menu-How to Change

There is a long list of collections that are defaults e.g. commentary series, that L4 automatically sets up.  I think that is how it works.  That list is inefficient and ineffective for what I want to do.  I can find no way to delete the ones I will not use.  I can easily set up a much shorter list of collections so that I don't have to scroll so far down to get at what I need.  I must be failing to find a setting for this because it makes no sense to me that users have the ability to create rule based collections and yet, lack the ability to customize within the list.