I don't understand how classes work in this tool. It looks like you can only edit styles on individual elements. I can see classes, but I don't see a way to c

I don't understand how classes work in this tool. It looks like you can only edit styles on individual elements. I can see classes, but I don't see a way to change the class of an element, or to change the CSS properties of a class. I even tried applying different changes to the same class — larger font for one element, smaller font for another element with the same class — and CSS Pro is happy to give me contradicting CSS rules. Example: https://imgur.com/a/qT1y95T https://imgur.com/a/qT1y95T CSS with a separate rule for every element is unworkable. How is the exported CSS supposed to work?