How to edit footnote in LyX

Question

Is it be possible to edit the footnote of the title of the presentation? I want to edit the author name (because by default it comes with department name) and title of the presentation (because it is quite large). Can it be different from the main title?

Answer 1

To suppress the parentheses, you can (re)define the footline beamer template (as defined in the outer theme infolines which is internally used by Madrid); for your other question, you can use the optional argument of \title:

\documentclass{beamer}
% Add to preamble from here ------------------
\usetheme[secheader]{Madrid}

\makeatletter
\setbeamertemplate{footline}
{
  \leavevmode%
  \hbox{%
  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{author in head/foot}\insertshortauthor%~~\beamer@ifempty{\insertshortinstitute}{}{(\insertshortinstitute)}
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshorttitle
  \end{beamercolorbox}%
  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
    \usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{2em}
    \insertframenumber{} / \inserttotalframenumber\hspace*{2ex} 
  \end{beamercolorbox}}%
  \vskip0pt%
}
\makeatother
% To here ----------------------

\author{A.U. Thor}
\title[The Title in footline]{The Title in the document}
\institute{The Institute}

\begin{document}  

\begin{frame}\maketitle\end{frame}
\section{Test section}
\subsection{Test subsection one}
\begin{frame}\frametitle{adafdg}Test\end{frame}
\subsection{Test subsection two}
\begin{frame}Test\end{frame}

\end{document}

EDIT: This is the whole code for a LaTeX user, so just include the marked part in your LyX preamble