Here's an rundown of some new features recently released to the Developer Center.
The left and right sidebars can now be individually collapsed and expanded. Hover over a collapsed sidebar to peek and interact with it. This feature was added to maximize the size of the center reading pane on smaller displays.
Default state (open):
Both sidebars collapsed:
The Invocations and Execute Request sections of the API Explorer will now show the full request (in HTTP format) using the data you've entered. This will allow you to view your query params, path params, headers, and request body as a formatted API request.
A tooltip show shows when starring API resources and pages. Starred API resources and pages can be found in the toolbox (click the wrench in the lower right corner of the window). See the Using API Explorer: Starring Resources and Bookmarking Pages guides for more information.