If in Labregister a Category is definitely no longer needed, if only because (e.g.) another Category was copied unnecessarily, then this can be done as described below.

  1. Click OPTIONS.
  2. Click Delete category.

  1. A pop-up will explain what is going to happen. Click DELETE to execute.

Tip: As you can see in the screenshot for point 5 of "How to unhide", it is also possible to delete a Category while hidden. It is therefore always advisable to hide a category prior to (possibly) deleting, to give users the opportunity to object.