Style → General... → Measure
The handbook's entry "Style → General... → Measure" is most unhelpful with its grand total of three sentences: "Sets measure spacing as well as margins. The measure spacing and minimum measure width are keys to controlling the number of measures per line. Changing the other settings would be unusual." Well, I guess I'm "unusual" since with nearly every score I write I find myself wanting not merely to change the measure style but also to increase distance between notes and barlines, among other settings. But without thorough documentation it's a constant battle of hit-or-miss.
So I have a proposal for the developers. If you will please give me a list of exactly what each Measure option does, I will turn it into usable, clear (English) prose that you can paste into the handbook for its next revision. I have a degree in technical writing; the result will be professional and require no further editing from you.