How do I ignore the titlesec package, and create a subsection without runin?

Question

I'm using the titlesec package to have runin subsection titles. However, I only want this some of the time, and if I try to break the line with \ it either throws an error to adds some weird indentation. Can anyone help?

% Inline subsection
\usepackage{titlesec}
\titleformat{\subsection}[runin]% runin puts it in the same paragraph
        {\bfseries}% formatting commands to apply to the whole heading
        {\thesubsection}% the label and number
        {0.5em}% space between label/number and subsection title
        {\large}% formatting commands applied just to subsection title
        []% punctuation or other commands following subsection title

Answer 1

Here, try this:

\subsubsection{My header (singled out)}
\paragraph{}\noindent
% paragraph

If you use it often, you can put it into a command

\newcommand{\singlesubsec}[1]{\subsection{#1}\paragraph{}\noindent}

which you would then use (to replace the above) as

\singlesubsec{My header (singled out)}
% paragraph

MWE:

\documentclass{article}

% Inline subsection
\usepackage{titlesec}
\titleformat{\subsection}[runin]% runin puts it in the same paragraph
        {\bfseries}% formatting commands to apply to the whole heading
        {\thesubsection}% the label and number
        {0.5em}% space between label/number and subsection title
        {\large}% formatting commands applied just to subsection title
        []% punctuation or other commands following subsection title
        
\usepackage{lipsum} % just for dummy text
        
\begin{document}

    \subsection{Header in-line}
    
    \lipsum[1]
    
    \subsection{Header on own}
    \paragraph{}\noindent
    \lipsum[1]
    
\end{document}