This is not a LyX problem.
LyX produces a tex-file that is stored (on my system) under
/tmp/lyx_tempdir.random/ and than runs latex (pdflatex lualatex ...),
makeindex, biber/biblatex on the tex file (several times, to get the
idx, lot ... files).
You can open the tex file and search \printbibliography[options], insert
\begin{multicols}{2} before and \end{multicols} after and than run
pdflatex or xelatex (whatever you choose) on the file.
With Debian,
1. Install kile.
2. Run pdflatex /lualatex /xelatex from LyX (depending on the format
chosen in the document settings) to produce a pdf
3. open the tex file under /tmp/lyx_tempdir with kile
4. In kile, there is a drop down menue (next to "Wiederherstellen") --
choose pdflatex/lualatex/xelatex (whatever fits)
You get a new version of the pdf file in the same directory, can look at
the log file and so on.
With my system it works without any problems, as you have seen (you may
have to insert \cleardoublepage).
Am 27.04.23 um 11:11 schrieb Wolfgang Engelmann:
I use LyX
Version 2.4.0-beta2 (Sonntag, 11. Dezember 2022)
Qt-Version (Laufzeit): 5.15.2 (Plattform: xcb)
Qt-Version (bei Erstellung): 5.15.2
OS-Version (bei Erstellung): Debian GNU/Linux 11 (bullseye)
Python-Aufruf: python3 -tt
At the end of my book text I have
Subject index
Name Index
Nomenclature
\begin{multicols}{2}
Biblatex-erzeugtes Literaturverzeichnis
\end{multicols]
Not sure, whether this stuff before the Subject index might have an
effect:
Weitere empfohlene Literatur
\begin{refsection}
here several citations
\printbibliography[heading=none]
\end{refsection}
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