The screenshot on the Atom.io site shows, that the editor has vertical lines which show how much a line is "tabbed" in. I wonder if this is an additional package or if it can be enabled in atom by default.
Open up your settings panel, usually by selecting the Preferences
option in the Edit
menu. Inside there, select the Editor
submenu. In the Invisibles
section, select the option titled Show Indent Guide
. The vertical line indentation markers will then appear for you like in the image.