Being able to delete password history

Here’s another work-around:

  1. Edit a login item.
  2. Create 6 custom fields of the Hidden type; if you have existing custom fields that are of the Hidden type, make sure that the 6 new fields are last in the list of custom fields.
  3. Give these 6 custom fields identical names.
  4. Give the 6 custom fields values that are unique (e.g., 1, 2, 3, 4, 5, and 6).
  5. Save the item.
  6. Open the login item for editing again, but make no changes.
  7. Save the item again.

Now, the password history will be effectively disabled, because it will always display the values given to the last 5 of the 6 hidden fields (e.g., 2, 3, 4, 5, and 6). Thus, the previous passwords will not be captured in the history anymore.