Width of multi-measure rests?

Is there any way to tweak the width of multi-measure rests? Don’t see anything under note spacing, which would seem to be the logical place.

I’m trying to emulate the style common in 19th C. scores where multi-measure rests, no matter how long, are fairly narrow, say maybe 80% of the width of a measure of quarter notes, or even a bit less.

Look under Engraving options>Rests>Multibars rests>Spacing

Yes, there are decent controls for this on the Rests page of Engraving Options. You can also edit the width of an individual H-bar via the Properties panel in Engrave mode.