The following image shows the main elements of a default Ulysses window in Standard Mode.
  1. Filter Field
  2. Filter Field
  3. Filter Button
  4. Document Tabs
  5. Document Tabs
  6. Notes View Switch
  7. Add/Remove Notes
  8. Notes View Switch
  9. Add/Remove Notes
  10. Groups & Collections
  11. Groups & Collections
  12. Document Browser
  13. Document Browser
  14. Document Preview
  15. Document Preview
  16. Notes Preview
  17. Notes Preview
  18. Document Statistics
  19. Editor
  20. Document Info
  21. Note Pad

You can also find an overview of the Ulysses interface in the introductory Screencast Web Resource.