--- title: 'managerHead' --- Parent: [main.js|ts configuration](./main-config.md) Type: `(head: string) => string` Programmatically adjust the manager's `` of your Storybook. For example, load a custom font or add a script. Most often used by [addon authors](../addons/writing-presets.md#ui-configuration). If you don't need to programmatically adjust the manager head, you can add scripts and styles to `manager-head.html` instead. For example, you can conditionally add scripts or styles, depending on the environment: