\DocumentMetadata{tagging = on}
\documentclass{ltx-talk}

\EditInstance{footer}{std}{
  color         = black!50,
  separator     = \hfill|\hfill,
  element-order = {date, author, title, institute, framenumber},
  right-hspace  = 3mm,
  left-hspace   = 3mm,
}

\author{Author Name}
\title[short-title = {Presentation title}]
  {A Long Presentation Title Which Would Not Fit in a Footer!}
\institute{Interesting Conference}

\begin{document}

\begin{frame}
  \maketitle[framestyle = wallpaper]
\end{frame}

\begin{frame}
  content
\end{frame}

\end{document}