Think of Guides as three apps that share one library:

   Studio          Reader           Portal
 (create/edit)   (read/resume)   (org library)
       \              |              /
        \             |             /
         ----  same guides  ----
                    |
              guides.co/g/{name}

• Studio - "What am I making?" My work shelf, new guide flow, publish settings.
• Reader - "What am I reading?" Continue reading, saved guides, channel shelves.
• Portal - "Our organization's library." Channels, members, invitations, custom domain.

Use the Guides menu (avatar, top right) to jump between Studio, Reader, and Portal.