In scientific texts it is common and for some articles in many journals necessary to make an extra footnote or endnote for each reference. These journals also demand that within the main text more than 2 subsequent reference numbers should be written like: 2-5. If libreoffice should be really an alternative for usage in scientific writing at universities the correct implementation of a hiding feature concerning the reference number (footnote/endnote anchor) as given in MS-office is absolutely vital. Otherwise the libreoffice writer is not usable for millions of students and scientists.
If you write 2- 3 4 5 and try to hide 3 4 (together with the spaces), the endnotes themselves are also hidden.
A work around using small font size and white color leads to terrible spaces if you have more reference (e.g. 23-30). Interestingly these formattings are not applied to the endnotes themselves. Therefore the vanishing of the endnotes and also footnotes by hiding their reference number seems to be a bug.
In addition, if the whole text within an endnote or footnote is hidden the footnote/endnote is hidden completely. This can be avoided by at least leaving one space unhidden. As there is already this mentioned way to do so, there is no reason why the note itself should vanish, when the anchor is hidden, if the user would need this in some rare cases.
Whereas hiding only the reference number (footnote/endnote anchor) is a quite often needed feature.
(Besides the possibility to add a "hidden" button to the toolbar would be nice, but is not so important.)
At the moment I have to stick to MS-Word.
(A second, not really vital thing that keeps me at the damned Microsoft Word is the nice feature "Do Full Justification the way WordPerfect 6.x for Windows does". For many years people are asking for this feature in open office. Seems to be very difficult to implement.)
Werner