[Tex/LaTex] Appendix title on a new line

appendicessectioningtitles

I am trying to modify the appearance of the Appendices in my thesis work.
I am using:

\documentclass[a4paper,10pt]{article}
\usepackage[titletoc,title]{appendix}

\begin{document}
...
\begin{appendices}
\section{Quantum Mechanics representations}
...
\section{Useful relations}
...
\end{appendices}

\end{document}

But I get something like:

Appendix A Quantum Mechanics representations

…

Appendix B Useful relations

…

Instead of this, I would like the titles of the sections to be on a new line, e.g.

Appendix A

Quantum Mechanics representations

…

Appendix B

Useful relations

…

Do you know how to achieve this?

Best Answer

You can load the titlesec package and change the way sections are typeset when starting your appendices through the command

\titleformat{\section}[display]
    {\normalfont\Large\bfseries}{\appendixname\enspace\thesection}{.5em}{}

MWE:

\documentclass[a4paper,10pt]{article}
\usepackage{titlesec}
\usepackage{lipsum} %just for the example

\usepackage[titletoc,title]{appendix}

\begin{document}

\section{Test}
\lipsum[1]

\begin{appendices}
\titleformat{\section}[display]
  {\normalfont\Large\bfseries}{\appendixname\enspace\thesection}{.5em}{}

\section{Quantum Mechanics representations}
\lipsum[1]
\section{Useful relations}
\lipsum[1]
\end{appendices}

\end{document}

Output

enter image description here

You can even add these lines in your preamble

\makeatletter
\g@addto@macro\appendices{%
  \titleformat{\section}[display]%
    {\normalfont\Large\bfseries}{\appendixname\enspace\thesection}{.5em}{}%
}
\makeatother

to avoid using \titleformat inside the document.

The following MWE produces the same result:

\documentclass[a4paper,10pt]{article}
\usepackage{titlesec}
\usepackage{lipsum} %just for the example

\usepackage[titletoc,title]{appendix}

\makeatletter
\g@addto@macro\appendices{%
  \titleformat{\section}[display]%
    {\normalfont\Large\bfseries}{\appendixname\enspace\thesection}{.5em}{}%
}
\makeatother

\begin{document}

\section{Test}
\lipsum[1]

\begin{appendices}

\section{Quantum Mechanics representations}
\lipsum[1]
\section{Useful relations}
\lipsum[1]
\end{appendices}

\end{document}
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