Saving style changes

Hi! New to MuseScore, and trying to learn by doing. Mostly going well but one problem I can't solve: changing measure numbers. I've discovered by going on my PC version to Format>Style>Measure Numbers I can adjust the measure numbering system to what i'm looking for: start with the first measure, and add numbers every four measures thereafter. I can see the system making that change on my score in the background. But there's not a Save or Apply button at the bottom of the Measure Numbers page, and when I go back to my score, the measure numbers revert to default settings. What am I doing wrong?