X-Ray is an editor lens that shows you the structure SilverBullet’s indexer sees in your document. When switched on, every text range the indexer extracts as an Object is underlined. When you hover your mouse over it, it will show you all the attributes extracted as YAML.
Run ${widgets.commandButton "Editor: Toggle X-Ray"}. The setting is sticky, it persists across page navigations and reloads until you run the command again.
range-less objects (page, tag, aspiring-page, anchor) aren't shown.