On the current score I'm working on I want 4 measures per system but as I ad music sometimes the program "auto fills" systems and I end up with one system with 3 measures and then two and then 3 and so on. So I click on the format pull down menu and click on add/remove system breaks and select "break systems every ?? measures" (in this case 4) but I still have a few systems with less than 4 measures. Using the system break tool only moves measures "forward" or closer to the end which has the effect of expanding the score. I'd like to compress the score by moving measures for one system BACK to the previous system so it evens things out and I keep my 4 measures per system format. If I have systems with more than 4 measures the system break tool is effective. If I have systems with less than 4 measures how do I get the 3 or two measure system back to 4 measures?