Multi-measure rest length control

Multi-measure rests have a length according to their total duration, which is under the control of the space-increment property of the MultiMeasureRest grob; its default value is 2.

\version "2.24"

\relative c' {
  \omit Staff.TimeSignature
  \compressEmptyMeasures

  R1*2 R1*4 R1*64 R1*16 \break
  \override MultiMeasureRest.space-increment = 4
  R1*2 R1*4 R1*64 R1*16
}

\layout {
  ragged-right = ##t
}