Vertical alignment in longtable cells

longtablevertical alignment

I read hundreds of threads now, but I don't get the point. Why isn't the text in the left column of the following table vertically centered?

\documentclass{article}
\usepackage[utf8]{inputenc}

\usepackage{booktabs}
\usepackage{multirow}
\usepackage{pdflscape}
\usepackage{longtable, array}
\usepackage{lipsum}

\begin{document}

\begin{landscape}
  \begin{longtable}{ m{0.1\linewidth} p{.35\linewidth}p{.55\linewidth} }
  \endfirsthead
  \endhead
  \toprule
  \textbf{Enum} & \textbf{Example} & \textbf{Description} \\
  \midrule
  1 & test & \lipsum[50]\\
  \midrule
  2a & test & \lipsum[50]\\
  2b & test & \lipsum[50]\\
  \bottomrule
  \end{longtable}
\end{landscape}

\end{document}

My local compiler as well as overleaf produce the following output
enter image description here

Can anybody help? If possible I would also like to have the text in the left column centered horizontally, but I think this will be done quickly then.

Best Answer

https://github.com/AnMnv/eBook (example 4.11)

enter image description here

\documentclass{article}
\usepackage[left=1.5cm,right=1.5cm,
    top=1.5cm,bottom=2cm,bindingoffset=0cm]{geometry}
\usepackage{float}
\usepackage{array, makecell}
\usepackage[utf8]{inputenc}
\usepackage{lipsum}
\usepackage{booktabs}

\usepackage{multirow}
\usepackage{pdflscape}
\usepackage{longtable, array}


\begin{document}

\begin{landscape}
\begin{longtable}{@{} *{2}{m{.\paperwidth}} *{1}{m{.40\paperwidth}} @{}}
\endfirsthead
\endhead
\toprule
\textbf{Enum} & \textbf{Example} & \textbf{Description} \\
\midrule
1 & test & \lipsum[50]\\
\midrule
2a & test & \lipsum[50]\\
2b & test & \lipsum[50]\\
\bottomrule
\end{longtable}
\end{landscape}

\end{document}
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