Zbyněk Burget wrote:
Splitting it onto two lines is unavailing. Therefore i want way to expanding 
width of
this line.

The default layout puts poet, instrument and composer all on one line.
This is not compatible with the length of your composer text.
Even if instrument is unused, its (centred) layout is still active and this
obstructs leftward expansion of the composer text.

If you want to stay close to what the default offers, you could
move the composer field down onto its own line:
i.e.   insert    "" } \fill-line { ""   into bookTitleMarkup
using the technique suggested in NR 3.2.2.

Cheers,
Robin

\paper {
  bookTitleMarkup = \markup {
    \override #'(baseline-skip . 3.5)
    \column {
      \fill-line { \fromproperty #'header:dedication }
      \override #'(baseline-skip . 3.5)
      \column {
        \huge \larger \bold
        \fill-line {
          \larger \fromproperty #'header:title
        }
        \fill-line {
          \large \smaller \bold
          \larger \fromproperty #'header:subtitle
        }
        \fill-line {
          \smaller \bold
          \fromproperty #'header:subsubtitle
        }
        \fill-line {                        
           \fromproperty #'header:poet
           { \large \bold \fromproperty #'header:instrument }
           "" 
        }
        \fill-line { 
           ""
           \fromproperty #'header:composer
        }
        \fill-line {
          \fromproperty #'header:meter
          \fromproperty #'header:arranger
        }
      }
    }
  }
}


\header { 
  title = "title_line" 
  poet = "poet_line"
  instrument = "instrument_line"
  composer = "composer_line_____20________30________40________50________60________70________80"
  meter = "meter_line"
  arranger = "arranger_line"
}

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