The OAS 3.0 Content page of the REST Service editor shows the OpenAPI definition of the service that is currently selected in the Navigator panel. ReadyAPI displays this page for services that are based on OpenAPI 3.0.x specifications.
Below is a sample view of the page:
Click the image to enlarge it.
The page displays the entire specification. The tree on the left is a tree of contents. To jump to some specification item quickly, simply double-click it in the tree.
The page stores the history of item navigation. Use the toolbar commands – 
and 
– to go back and forth in the history.