All the articles open inside the panel, you can move the panel using drag and drop and maximize it. The panel doesn't close when you click inside the app, so you can read Google's instructions and follow them.
Here are some screenshots from Gmail. Just click the gear button and select "Help" to see the help widget.
If you go to the contact manager, Google's suggested articles are about contacts.
Drag the header to move the help box.
Some Google services that use inline help: Gmail, Google Drive, Play Music, AdSense, YouTube, Google+.