# customisation

The Customize tab selects a catalog theme and changes the supported theme tokens: accent, fonts,
density, page size, photo treatment, icons, and page-number preference. `CvThemeCatalog` defines the
available first-party themes and plan entitlement. Existing Premium-theme documents remain readable
and exportable after downgrade.

See `docs/architecture/cv-theme-engine.md` for the data model.