Sero includes profile-scoped theme customization. Theme state is local profile state and may change as the beta design system continues to evolve.
Start with theme selection when you only need to switch between saved presets or verify the current profile's active theme.

Use the theme editor when you need to inspect or modify the preset itself rather than simply selecting it.

Color-token editing is useful for understanding which named values drive the shell and plugin surfaces.

The preview area helps confirm whether a theme change reads correctly across common UI elements before you keep it.

Sero has a local styleguide app for testing theme behaviour away from the main desktop shell and plugin runtime:
Use the Diagnostic Swap preset to catch token mistakes. Brand accents should use primary or secondary brand tokens. Success, warning, error, and code colours should only change the UI they describe.