If you only want to affect the position of mark above GrandStaff, not
above the
full score, should should say
\override Staff.RehearsalMark ...
instead of
\override Score.RehearsalMark ...
For example, you can do things like
\new Staff \with {
\consists Mark_engraver
\override
This is sort of a repeat from many months ago. It might be a bug; it
might not.
Try running the snippet below. The result is that \mark on the top
line is placed as expected; \mark attached to GrandStaff is pushed
way too far to the left. Any attempt to manipulate the second \mark's
