# sidebar.rail

Part of [Sidebar](https://kernstra.com/docs/web-sdk/config/sidebar) in the Kernstra Web SDK 1.0.0 configuration reference.

- Type: `boolean`
- Default: `true`
- Page: https://kernstra.com/docs/web-sdk/config/sidebar/rail

The rail of tab buttons (a phone's tab row) and the panel's collapse / close button; `false` when your own chrome toggles the panels through [`openPanel()`](https://kernstra.com/docs/web-sdk/api/pdfviewer/openpanel).

```ts
toolbar: { layout: 'none' },
sidebar: { rail: false }, // your own Pages button, not ours beside it
```

Web page: https://kernstra.com/docs/web-sdk/config/sidebar/rail