[Tex/LaTex] Removing sidebar from a single beamer frame

Question

I like using the Beamer Goettingen theme as it has a nice sidebar. I would like to remove this from occasional slides, so the text can go all the way across. However, while the [plain] option removes the side bar, the text still wraps as if the side bar were there (minimal worked example below). How do I get text to wrap across slide?

\documentclass{beamer}
\usetheme{Goettingen}
\usepackage{lipsum}
\usecolortheme{seahorse}

\begin{document}

\begin{frame}[plain]{title}

\lipsum

\end{frame}

\end{document}

Answer 1

\documentclass{beamer}
\usetheme{Goettingen}
\usepackage{lipsum}
\usecolortheme{seahorse}

\begin{document}

\begin{frame}{title}

\lipsum

\end{frame}

\begin{frame}[plain]{title}
\advance\textwidth2cm
\hsize\textwidth
\columnwidth\textwidth
\lipsum

\end{frame}

\end{document}