On the system may be 100 system fonts. They are all shown in every font selection. This make not really sense, because the sets of special symbols are between them.
There should be a list of installed fonts, from which you can choose the fonts used in LibreOffice.
I believe bug 88416 has a similar idea to this.
(In reply to Yousuf (Jay) Philips from comment #1)
That's what I mean.
*** This bug has been marked as a duplicate of bug 88416 ***