I have had this before and was able to solve it but now I just can’t find what to do:
I have a 32 measure lead sheet.
Everything is fine except the last staff line, 4 measures, covers only about half the width of the page.
After an hour of searching through the various options and preferences dialogs I can’t find anything to change it.
(Other than adding an extra measure at the end and then adding a system break).
This is set up for 5 bars per line with manual system breaks at the 4 bar break. I didn’t find another way to handle the first staff line with 4 bars and a one beat pickup measure.