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I have the following slide:

\documentclass[beamer]{beamerswitch} \usetheme{metropolis} \beamerdefaultoverlayspecification{<+->} \begin{document} \begin{frame}\frametitle{My title} \begin{columns}[t] \begin{column}{0.49\textwidth} \begin{block}{Left side} \begin{itemize} \item First item; \item Second item; \end{itemize} \end{block} \end{column} \begin{column}{0.49\textwidth} \begin{block}{Right side} \begin{itemize} \item First item; \item Second item; \end{itemize} \end{block} \end{column} \end{columns} \end{frame} \end{document}

When I compile it, I get 9 pages. On slides 1-2, only the title appears. "Left side" appears on slide 3, and "Right side" appears on slide 7.

What should I change so that "Left side" appears on slide 1 already and there are no extra steps on slide 2 and 6? I would like to keep the default overlay specification for the document.

EDIT: By trial and error, I found this solution:

\documentclass[beamer]{beamerswitch} \usetheme{metropolis} \beamerdefaultoverlayspecification{<+->} \begin{document} \begin{frame}\frametitle{My title} \beamerdefaultoverlayspecification{} %switch off for this slide \begin{columns}[t] \begin{column}{0.49\textwidth} \begin{block}{Left side} \begin{itemize}[<+(1)->] \item First item; \item Second item; \end{itemize} \end{block} \end{column} \begin{column}{0.49\textwidth} \begin{block}{\uncover<4->{Right side}} \begin{itemize}[<+(2)->] \item First item; \item Second item; \end{itemize} \end{block} \end{column} \end{columns} \end{frame} \end{document}

I don't understand why it does what it does. If \beamerdefaultoverlayspecification{<+->} is in effect, beamer poses twice after printing the title. Why? It seems something is changing the value of the beamerpauses counter, but if I understand the manual correctly, neither the column nor the block environment is supposed to do that. So what's injecting all these pauses?

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2 Answers 2

Reset to default
2

Next try. [<+(1)->]

\documentclass[beamer]{beamerswitch} \usetheme{metropolis} %\beamerdefaultoverlayspecification{<+->} \begin{document} \begin{frame}\frametitle{My title} \begin{columns}[t] \begin{column}{0.49\textwidth} \begin{block}{Left side} \begin{itemize}[<+(1)->] \item First item; \item Second item; \end{itemize} \end{block} \end{column} \begin{column}{0.49\textwidth} \begin{block}{Right side} \begin{itemize}[<+(1)->] \item First item; \item Second item; \end{itemize} \end{block} \end{column} \end{columns} \end{frame} \end{document}

enter image description here

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  • I have dozens of slides. It would be a lot of extra work to add the overlays manually for each. There must be a better way. Commented Feb 26, 2019 at 23:53
  • @GrB Fair enough. I changed the answer. Commented Feb 26, 2019 at 23:59
  • Again, I need to keep \beamerdefaultoverlayspecification{<+->}. Once you uncomment it, the problem is actually worse: only the title on slides 1-2, "Left slide" on slides 3-4, only "Right side" on slides 7-8. Commented Feb 27, 2019 at 12:07
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Unfortunately I can not say anything to why this happens, but the following fixes the issue for me through patching the columns and column environments with etoolbox:

\usepackage{etoolbox} % when using columns we get two empty pages before itemize without this, % when using \beamerdefaultoverlayspecification{<+->} \preto\columns{\addtocounter{beamerpauses}{-1}} \preto\column{\addtocounter{beamerpauses}{-1}}

After that no empty pages appear before the list, and the overlaying runs through both columns like expected.

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