While I might have misunderstood what you’re after I think the answers in this
thread https://mail.gnu.org/archive/html/lilypond-user/2021-05/msg00018.html
may give you some useful hints if you center the markups produced by
\score-lines instead of right-aligning them, as was the case there.
> 16 aug. 2021 kl. 20:58 skrev josh <josh.jone...@gmail.com>:
>
> Hello,
>
> I have a score that has system breaks (defined by \break) at specific random
> intervals. Some systems have two bars, some have eight, some have twelve, etc.
>
> I have ragged-right set to true and I am looking to horizontally center every
> system on its own page, regardless of length. I have tried the methods here
> and here but I have still come up short.
>
> I have attached the drill score to this email for reference. All of the part
> definitions refer to an \include file. If there's any other information that
> would be useful I'll be glad to provide it.
> --
> -josh
>
\score {
<<
\new StaffGroup <<
\AMillionDreamsSoloMellophoneOneScore
\AMillionDreamsSoloMellophoneTwoScore
>>
\new StaffGroup <<
\AMillionDreamsFluteOnePart
\AMillionDreamsFluteTwoPart
\AMillionDreamsClarinetOnePart
\AMillionDreamsClarinetTwoPart
\AMillionDreamsBassClarinetPart
\AMillionDreamsAltoSaxOnePart
\AMillionDreamsAltoSaxTwoPart
\AMillionDreamsTenorSaxPart
>>
\new StaffGroup <<
\AMillionDreamsTrumpetOnePart
\AMillionDreamsTrumpetTwoPart
\AMillionDreamsMellophonePart
\AMillionDreamsTromboneOnePart
\AMillionDreamsTromboneTwoPart
\AMillionDreamsBaritonePart
\AMillionDreamsTubaPart
>>
\new StaffGroup <<
\AMillionDreamsPianoPart
\AMillionDreamsVibraphoneOnePart
\AMillionDreamsVibraphoneTwoPart
\AMillionDreamsMarimbaOnePart
\AMillionDreamsMarimbaTwoPart
\AMillionDreamsSnarePart
\AMillionDreamsTenorsPart
\AMillionDreamsBassesPart
>>
\new Dynamics {
\startMeasureCount
s1*55
\stopMeasureCount
}
<<
\amilliondreamsdrillscorepart
>>
>>
\layout {
indent = #12
short-indent = .4\cm
ragged-right = ##t
\set Score.markFormatter = #format-mark-box-letters
#(layout-set-staff-size 7)
\context {
\Score
\omit BarNumber
}
\context {
\Dynamics
\consists #Measure_counter_engraver
\override MeasureCounter.direction = #DOWN
\override MeasureCounter.font-encoding = #'latin1
\override MeasureCounter.font-shape = #'italic
\override MeasureCounter.font-size = #5
}}}>
