System grouping - too few measures per line, too many in another line

I'm working on a chart. I want to keep a verse to one line, a chorus to one line, etc. so that I can fit the whole chart on a single page and structure is quickly readable. However, when I create a system it gives two entire lines to two measures and a third line has 6 measures. This could/should all fit on one line.

I've tried using '{' and '}' but that only adjusts the measure widths with a multi-measure line, not how many measures fit with in a line.