LaTeX beamer: How to use "squeeze" option only for part of a slide?

Question

I'm using the beamer package for a presentation. On some slide, I have two lists, one long list on the left with many short items, one short list on the right with some explanations. The list on the left only fits onto the slide when using the squeeze option. The right list, however, then looks too compressed.

Is there a way to make the squeeze option only apply to the left list?

---

Minimal example:

\documentclass[9pt]{beamer}
\usetheme{Madrid}
\begin{document}

\begin{frame}[squeeze] % <- squeeze option
  \frametitle{Title}
  % two-column layout
  \begin{columns}
    \begin{column}[T]{4cm}
      \centering
      % left: long list with short items
      \begin{block}{}
        \begin{itemize}
          \item $e$
          \item $\mu$
          \item $\mu \lor e$
          \item $\mu \land e$
          \item $\mu\mu$
          \item $ee$
          \item $ee \lor \mu$
          \item $ee \lor e$
          \item $\mu\mu \lor e$
          \item $\mu\mu \lor \mu$
          \item $\mu\mu \lor ee$
          \item $(e \land \mu) \lor \mu\mu$
          \item $(e \land \mu) \lor ee$
          \item $(e \land \mu) \lor ee \lor e$
          \item $(e \land \mu) \lor ee \lor \mu$
          \item $(e \land \mu) \lor \mu\mu \lor \mu$
        \end{itemize}
      \end{block}
    \end{column}
    \hfill
    \begin{column}[T]{6cm}
      \centering
      % right: shorter list with explanations / remarks  <- this would be nicer if not squeezed
      \begin{block}{}
        \begin{itemize}
          \item Many combinations
          \item Single and di-object trigger
          \item Also works for jet triggers
          \item Primary goal lepton triggers \\
            (plateau efficiency below $1$)
        \end{itemize}
      \end{block}
    \end{column}
  \end{columns}

  % another box at the bottom
  \begin{block}{}
    \begin{itemize}
      \item $\lor$: logical OR, $\land$: logical AND
      \item $ee$: di-electron trigger etc.
    \end{itemize}
  \end{block}
\end{frame}

\end{document}

Answer 1

Try something like \setlength{\itemsep}{.5ex} within one of the itemize environment. \itemsep is added to the normal \parsep so you can also use negative values, too. I used .5ex but you can adjust that to your personal taste:

\documentclass[9pt]{beamer}
\usetheme{Madrid}
\begin{document}

\begin{frame}[squeeze] % <- squeeze option
  \frametitle{Title}
  % two-column layout
  \begin{columns}
    \begin{column}[T]{4cm}
      \centering
      % left: long list with short items
      \begin{block}{}
        \begin{itemize}
          \item $e$
          \item $\mu$
          \item $\mu \lor e$
          \item $\mu \land e$
          \item $\mu\mu$
          \item $ee$
          \item $ee \lor \mu$
          \item $ee \lor e$
          \item $\mu\mu \lor e$
          \item $\mu\mu \lor \mu$
          \item $\mu\mu \lor ee$
          \item $(e \land \mu) \lor \mu\mu$
          \item $(e \land \mu) \lor ee$
          \item $(e \land \mu) \lor ee \lor e$
          \item $(e \land \mu) \lor ee \lor \mu$
          \item $(e \land \mu) \lor \mu\mu \lor \mu$
        \end{itemize}
      \end{block}
    \end{column}
    \hfill
    \begin{column}[T]{6cm}
      \centering
      % right: shorter list with explanations / remarks  <- this would be
      % nicer if not squeezed
      \begin{block}{}
        \begin{itemize}\setlength{\itemsep}{.5ex}
          \item Many combinations
          \item Single and di-object trigger
          \item Also works for jet triggers
          \item Primary goal lepton triggers \\
            (plateau efficiency below $1$)
        \end{itemize}
      \end{block}
    \end{column}
  \end{columns}

  % another box at the bottom
  \begin{block}{}
    \begin{itemize}
      \item $\lor$: logical OR, $\land$: logical AND
      \item $ee$: di-electron trigger etc.
    \end{itemize}
  \end{block}
\end{frame}

\end{document}