Modifying index layout / too much vertical space above index title

[johnny7]

Am 05.04.2022 um 08:45 schrieb johnny7:
> This is a crosspost with
> https://tex.stackexchange.com/questions/639665/lyx-index-title-does-not-align-with-section-titles
>
> But the issue seems quite LyX-specific. When adding an index in a LyX
> document, the title "Index" (or its modified name) does not vertically
> align with other section titles in the output. There is more vertical
> space above it. This can also be seen in the German and English LyX
> manuals, compare pp. 193 and 191 or pp. 177 and 175 respectively.
>
> Could this be related to the two-column-layout of the index? Could
> |titlesec| modify the index title in LyX?
>
> How can the index further be modified, e. g. how can I add a short
> prologue between the title and the first entry?
>
> I was also a bit confused about the index program. The User Guide says
> that xindy is used by default, but in the log I only find makeidx. In
> the global preferences the processor makeindex is selected.
>
> Thanks!
Adding \usepackage{imakeidx} to the preamble patches the different
spacing of the title, it also gives the opportunity to specify
\indexprologue{Text}.