I'm trying to learn configurations (finally - been using SW for 8 years). I set up 3 different configurations, and when you click between them, they don't change. So, I did some more reading. For each configuration I did the Rebuild/Save mark. Now, each configuration changes when I click it. But other models with working configurations show the checkmarks, not the "save" icon. So I "removed" the Rebuild/Save mark from each configuration. Now my check marks are back, and the configurations still work.
What did I actually do? What's the proper procedure?
(I am showing a movable assembly in 3 different configurations: extended, retracted, and centered.)