I need something similar to this post, that is the second line of the part should start directly at the left margin.
This is what I have tried:
\documentclass{memoir}
\setlength{\cftpartindent}{0em}
\setlength{\cftpartnumwidth}{0em}
\renewcommand{\cftpartaftersnumb}{\\}
\renewcommand*{\cftpartname}{Part\space}
\begin{document}
\tableofcontents*
\part{Test}
\end{document}
But for some reason the title on the second line is indented:

\mylengthto\cftpartnumwidth? This has the same effect here. (Well, actually I am getting a much more overfull hbox, but visually both solutions seem to be identical.) – Denis Mar 09 '19 at 22:56