> You are reading the Docusign Developer Documentation. For clean Markdown of any page, append .md to the page URL.
>
> Documentation indexes by section:
> - APIs and SDKs: https://docusign.docs.buildwithfern.com/docs/llms.txt
> - Platform 101: https://docusign.docs.buildwithfern.com/platform/llms.txt
> - Extension Apps: https://docusign.docs.buildwithfern.com/extension-apps/llms.txt
> - Docusign CLI: https://docusign.docs.buildwithfern.com/docusign-cli/llms.txt
>
> Authentication (OAuth, JWT Grant, M2M): https://docusign.docs.buildwithfern.com/platform/auth
> Webhooks and Connect: https://docusign.docs.buildwithfern.com/platform/webhooks
>
> OpenAPI specifications: https://docusign.docs.buildwithfern.com/openapi.json
> MCP server: https://docusign.docs.buildwithfern.com/_mcp/server

# Additional tab properties for custom tabs

Custom tabs now support additional tab properties that allow a tab to be shared or edited by all recipients in the envelope: 'collaborative,' 'requireAll,' and 'requireInitialOnSharedChange.' These properties are supported when creating the custom tab using the API, and when creating a recipient tab from a custom tab using the API, and are equivalent to the same properties supported within recipient tabs.Setting 'collaborative' to true enables collaboration. Setting 'requireInitialOnSharedChange' to true will route the envelope back to recipients who have already completed signing if a collaborative field is changed by a signer who appears later in the routing order.

[Learn More](/changelog/10-01-2020-5)