1

the option rframe=empty has not effect in showexpl. Here is a WME

\documentclass{article}
\usepackage{showexpl}

\begin{document}

Here is:
\begin{LTXexample}[rframe=empty]
\begin{center}
 Hello world!
\end{center}

\end{LTXexample}

\begin{LTXexample}[rframe=single]
\begin{center}
Good Bye!
\end{center}
\end{LTXexample}

\end{document}

Does anybody know how to delete the frame in the formatted text?

1

Use an empty value:

\begin{LTXexample}[rframe=]
\begin{center}
 Hello world!
\end{center}

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