Clicking on elements to resume an existing selector is just one method. You can also find all of your selectors via the folders menu (at the top left). And there is a search feature there where you can enter the selector name, it’s selection code, or any property/value e.g. “font-size” or “16px”
Does that help at all?
P.S. In a future update, MT will also record which page a selector was created on to help identify what a selector does (if it doesn’t target the current page).