This plug-in hides, or shows previously-hidden standard articulations within a selection. As articulations can not actually be hidden, they are deleted and hidden text is created in their place.
To show the articulations, run the plug-in again and the text will be converted back to the original articulations. This is useful for situations where it is desirable for playback to be different than a printed score. If you use your Sibelius scores for printing as well as playback, you may want to check this clutch out.