Added a new feature in Custom formatter for making fields readonly

[tpodugu-ms]

Category

• Content fix
• New article

What's in this Pull Request?

🎯 Add documentation for Custom Formatter Read-Only Fields in Microsoft Lists
📝 Description:
This PR introduces detailed documentation for the new Custom Formatter for Read-Only Fields feature in Microsoft Lists. The formatter allows fields to appear as read-only in various form views — enhancing usability for AI-generated content and preventing accidental edits.

✅ Key Highlights:
Introduction and Purpose: Explains the need for read-only fields, especially in AI-driven list item creation.
Field Settings: Defines name and readonly properties for easy configuration.
Behavior Breakdown: Details how the formatter behaves across New Item, Edit Form, and Edit All modes.
Example Use Cases: Illustrates practical scenarios like CRM bot-generated tickets.

📌 Why It Matters:
Enables users to view essential data without the risk of unintentional modifications.
Supports AI and automation scenarios by protecting critical fields.

[learn-build-service-prod]

Learn Build status updates of commit 89a3592:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/declarative-customization/list-form-configuration.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit ceb3d28:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/declarative-customization/list-form-configuration.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel