The following is a setuplist for the table of contents. Is there a way to
have the section part only go to 80% of the page width, similar to
width=0.8\textwidth

\setuplist
  [chapter]
  [style={\bf}]

\setuplist
  [section]
  [style={\tfx}]

\setuplist
  [chapter,section]
  [headnumber=no]

\setuplist
  [section]
  [alternative=d]

\placecontent