Printing the bar number for the first measure

By default, the first bar number in a score is suppressed if it is less than or equal to 1. By setting barNumberVisibility to all-bar-numbers-visible, any bar number can be printed for the first measure and all subsequent measures.

\version "2.24"

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

\relative c' {
  \set Score.barNumberVisibility = #all-bar-numbers-visible
  c1 | d | e | f \break
  g1 | e | d | c
}