You can now see all the components used in a screen! On the right panel under the Reusable Component section, click on the “See all components” link—this will list all the components used in the screen, and if they're connected to code or not.
If you click on a connected component, a pop-up will appear and show its code snippets, link status, and previews (if the component is linked to a story in Storybook). Clicking a component on the list will select it on the canvas too — and vice versa.
You can also do a search within the components.