I try to style the chapters (sections) of an article document (documentclass: article) using the latex titlesec package, but I don't get any results, I mean that when I configure the document there is no change.

In the YAML header of rmarkdown

## Style Chapter - package "TITLESEC"
  - \usepackage[T1]{fontenc}
  - \usepackage{titlesec, blindtext, color}

Outside the YAML header

<!-- TITLESEC - Estilo CAPÍTULOS -->

In the .tex file the code of the chapter (section):

\section{Name Section}\label{name-section}}

  • Welcome to TeX.SE!
    – Mensch
    Oct 30, 2021 at 22:27
  • Please provide an MWE (from \documentclass... to `\end{document}) that we can compile that shows your problem. Why should you expect us to try and assemble what you have done from your snippets? --- GOM Oct 31, 2021 at 18:50
  • sorry. the document is very long. I thought it was enough. I don't want to cause any inconvenience to anyone. I thought it could be a common configuration problem. Oct 31, 2021 at 19:30

1 Answer 1


As you noted, there are no chapters but sections in an article document class. Therefore, it's funny that you try to redefine a command that does not exist. On the other hand, it is not clear to me what are you trying to do with \titleformat, but I guess that you are searching for some like this:


docummentclass: article
    number_sections: yes
- \usepackage{titlesec, xcolor, lipsum}
# \titleformat{command}[shape]{format}{label}{sep}{before-code}[after-code]
- \titleformat{\section}{\Huge\bfseries}{\thesection\hspace{20pt}\textcolor{gray!75}{|}}{20pt}{}

# Introduction

# Objectives
  • I used your code above and got a big space between all chapter title words Jan 20 at 14:06
  • @MarkDavies With Rstudio and TexLive this example produces what you see here, that have no chapters (article documents have no chapters without a special tunning). Therefore, seems that you are not using only my code but something else, and that is your problem but that only you know. So what could I tell you more?
    – Fran
    Jan 22 at 12:38
  • Thanks. I have asked a new question: tex.stackexchange.com/questions/707695/… Jan 22 at 22:24

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