I had a similar issue last June but there no longer are old, deprecated, font style commands in my jabrefbib.bib file. I searched my lyx mail file (from 2005) without seeing this particular situation.
I've created a new KOMA-Script report class MWE (attached.) It has only a title and the question, "Why can't I change the bibliograpy style format in Document -> Settings -> Bibliography?" The style format data entry box has greyed out 'Natbib (BibTex)' and there are no other choices available. What do I do to fix this so I can select BibLaTeX as the style format (and related style choices?) TIA, Rich
#LyX 2.3 created this file. For more info see http://www.lyx.org/ \lyxformat 544 \begin_document \begin_header \save_transient_properties true \origin unavailable \textclass scrreprt \begin_preamble \date{} \usepackage{mathpazo,amssymb} \usepackage{graphicx,relsize} \usepackage{scrlayer-scrpage} \pagestyle{scrheadings} \makeatletter \@addtoreset{figure}{subsection}% Reset figure numbering at every part \makeatother \end_preamble \use_default_options false \begin_modules natbibapa \end_modules \maintain_unincluded_children false \language english \language_package default \inputencoding default \fontencoding global \font_roman "palatino" "default" \font_sans "avant" "default" \font_typewriter "courier" "default" \font_math "auto" "auto" \font_default_family rmdefault \use_non_tex_fonts false \font_sc true \font_osf false \font_sf_scale 100 100 \font_tt_scale 100 100 \use_microtype false \use_dash_ligatures false \graphics default \default_output_format default \output_sync 0 \bibtex_command biber \index_command default \paperfontsize default \spacing single \use_hyperref false \papersize custom \use_geometry true \use_package amsmath 1 \use_package amssymb 1 \use_package cancel 0 \use_package esint 0 \use_package mathdots 1 \use_package mathtools 0 \use_package mhchem 1 \use_package stackrel 0 \use_package stmaryrd 0 \use_package undertilde 0 \cite_engine natbib \cite_engine_type authoryear \biblio_style authordate4 \use_bibtopic false \use_indices false \paperorientation portrait \suppress_date false \justification true \use_refstyle 0 \use_minted 0 \index Index \shortcut idx \color #008000 \end_index \paperwidth 6in \paperheight 9in \leftmargin 0.75in \topmargin 0.9in \rightmargin 0.75in \bottommargin 0.9in \secnumdepth 3 \tocdepth 3 \paragraph_separation indent \paragraph_indentation default \is_math_indent 0 \math_numbering_side default \quotes_style english \dynamic_quotes 0 \papercolumns 1 \papersides 2 \paperpagestyle default \tracking_changes false \output_changes false \html_math_output 0 \html_css_as_file 0 \html_be_strict false \end_header \begin_body \begin_layout Title Minimal Wrong Example: KOMA-Script Report Class Bibliography \end_layout \begin_layout Standard Why can't I change the style format to biblatex? \end_layout \end_body \end_document
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