Your code is operating in the Voice context, and you need to be in the Staff context:
\set Staff.fontSize = #new-size \override Staff.StaffSymbol.staff-space = #(magstep new-size) \override Staff.StaffSymbol.thickness = #(magstep new-size) By the way, I wouldn't reduce the thickness property like this. Classical engravers did not use thinner lines when the staves were smaller. Thin staff lines are uncomfortable to read. - Mark
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