Hi Gian Paolo,

> how to write a score without time signature and bars placed on request?

Just remove the Time_signature_engraver:

\version "2.25.11"

\language "english"

\layout {
  indent = 0
  ragged-right = ##f
  \context {
    \Staff
    \remove Time_signature_engraver
  }
}

{
  \key d \major
  \time 5/2
  d'2 d' cs' d'1
  \time 7/2
  b2 d' d' d' cs' d'1
  \time 9/2
  b2 d' d' d' d' e'1 ~ 1
}

> I read the manual but didn't find a solution.

https://lilypond.org/doc/v2.23/Documentation/notation/visibility-of-objects#removing-the-stencil

That should have led you to the equivalent solution:

\version "2.25.11"

\language "english"

\layout {
  indent = 0
  ragged-right = ##f
}

{
  \omit Staff.TimeSignature
  \key d \major
  \time 5/2
  d'2 d' cs' d'1
  \time 7/2
  b2 d' d' d' cs' d'1
  \time 9/2
  b2 d' d' d' d' e'1 ~ 1
}

Hope that helps,
Kieren.
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