• Font: Fira Code
• Theme: City Lights (UI/Syntax)
• Other Stuff:
  • atom-beautify plugin
  • Soft-wrap on
  • Tabs > Spaces

Apparently it's a “wrap guide,” but I want to be able to make my line of code as convoluted as possible, dammit!

apm uninstall wrap-guide

or hide it with CSS:

.editor {
  .wrap-guide {
    visibility: hidden;
  }
}

or disable it with the “packages” menu item

https://discuss.atom.io/t/vertical-line-in-editor/2717/16