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Compare the two slides generated by the following code.

\documentclass[t]{beamer}
\usepackage{lipsum}
\begin{document}
\begin{frame}
  \lipsum
\end{frame}
\begin{frame}
  \begin{columns}[T]
    \begin{column}{0.5\textwidth}
      \lipsum
    \end{column}
    \begin{column}{0.5\textwidth}
      \lipsum
    \end{column}
  \end{columns}
\end{frame}
\end{document}

Notice how, in two-column mode, the side-margins are smaller, and the top margin is larger. This makes the layout on my slides inconsistent when I mix a two-column and one-column layout, particularly if I do so on the same slide.

How do I get LaTeX to stop messing with margins in two-column mode?

Thanks, -Willard.

P.S.: In case someone else has the same issue: In two-column mode, if I had an image in one column, then placing a theorem in the other column would move the image. I traced this issue to

\setbeamercolor{structure}{...}

which apparently does more than just colour things. To change colors, use

\usecolortheme[...]{structure}

instead.

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Try [onlytextwidth,t] instead of [T] (p. 125, beamer manual):

enter image description here

\documentclass[t]{beamer}
\usepackage{lipsum}
\begin{document}
\begin{frame}
  \lipsum[6]
\end{frame}
\begin{frame}
  \begin{columns}[onlytextwidth,t]
    \begin{column}{0.49\linewidth}
      \lipsum[6]
    \end{column}
    \begin{column}{0.49\linewidth}
      \lipsum[6]
    \end{column}
  \end{columns}
\end{frame}
\end{document}
share|improve this answer
    
I'd forgotten about that one! – Joseph Wright Aug 4 '14 at 10:48

I'm afraid this is 'status bydesign': looking over the code, the decision to have different margins is one that was made deliberately and not an accident/bug. As such, and because a change would affect many documents, it has to be viewed as a 'feature' of beamer. (There is no clue in the code as to why this decision was made!)

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