Insights report editor
The main panel of the Insights report editor page is the text editor itself, with a toolstrip of controls to add things like images, heading, italic text, etc. It should be familiar to anyone who has used word processors such as Microsoft Word or Google Docs. On the right is the control panel for saving, publishing, etc. Other controls are in the control bar at the top.
On larger screens, there is also a list of all your headings in the bottom-right. This can be used to jump to a particular point in the report without scrolling through manually.