That is called a SpanBar. BarLine only exists within a staff. See the bottom of this section of the Notation Reference: https://lilypond.org/doc/v2.19/Documentation/notation/bars#bar-lines
Following the links to SpanBar, and then to span_bar_engraver, you will learn that the span_bar_engraver is in the StaffGroup context. So what we need to do is omit the StaffGroup.SpanBar. \version "2.19.82" \score { << \new Staff {c'4 d' e' f'} \new Staff {c'4. d'4. e'4} \new Staff {c'2 d'2} >> \layout{ \omit StaffGroup.SpanBar } } HTH, Carl On 10/17/20, 2:45 PM, "lilypond-user on behalf of Gilberto Agostinho" <lilypond-user-bounces+carl.d.sorensen=gmail....@gnu.org on behalf of gilbertohasn...@googlemail.com> wrote: Hi everyone, I am trying to create a diagram using Lilypond and I would like to remove the vertical bar connecting a series of grouped staves. This is the bar that is in the left hand side of a score and runs through all staves, and where instrument names are normally written. Would it be possible to hide it somehow? Below is a minimal example: \version "2.19.82" \score { << \new Staff {c'4 d' e' f'} \new Staff {c'4. d'4. e'4} \new Staff {c'2 d'2} >> \layout{ \omit Score.BarLine } } https://i.postimg.cc/W3krqyTF/line.png The diagram I am creating has a complex rhythm and I am using a group of staves so that the rhythm of each line matches the one above, which is why I am trying to use this trick of grouping them and then hiding the connecting bar. Many thanks, Gilberto