# Sidebar extension declaration

Learn more about sidebar extension declaration properties.

## Sidebar extension declaration properties

| Key             | Type                           | Description                                               |
| --------------- | ------------------------------ | --------------------------------------------------------- |
| `extensionType` | Enum(`formSidebar`) (required) | Type of extension                                         |
| `name`          | `String`                       | Name of Sidebar UI Extension                              |
| `description`   | `String`                       | Description of Sidebar UI Extension                       |
| `config`        | `ConfigOptionsDefinition`      | Optional definition of _global_ configuration settings    |
| `sidebarConfig` | `ConfigFields`                 | Optional definition of _instance_ configuration setttings |