Guides
Themes
Preview and switch themes live, then make one permanent in your config.
Switch themes
Press t to open the theme switcher: filter by name and move (or hover) to
preview the whole UI live, enter to apply, esc to revert. stet ships dark
and light built-in themes and follows your terminal's appearance by default.

The switch lasts the session only. To make a theme permanent, or to define your
own, set it in your configuration, where a theme
can inherit another with base and override individual tokens or its syntax
highlighting.