The Admin Themes feature in LimeSurvey enables customization of the application's appearance.
Access admin theme settings by navigating to: Configuration → Advanced → Themes → Admin themes.
The Admin themes tab lists the available admin interface themes. LimeSurvey ships with the core Sea Green admin theme, and the active theme is marked Selected. The admin theme can also be set under Configuration → Global → General → Administration theme, where it applies installation-wide.
The following articles provide additional information about LimeSurvey's theming capabilities: