Format score, 4 measures per line

I am trying to format my score so that it will appear with four evenly spaced measures on each line. Musescore has a mind of its own. If it places five or more measures per line it is an easy fix to places the cursor over the bar line and press the enter key. If Musescore decides it should be three or fewer measures there is no way to adjust it. We are stuck, sometimes, with only the one measure on the line despite there fact, there is room for many more measures. There is no obvious way to increase to measure count on the line.