How do I change the displayed fields on the Possible Duplicates page of an account?

Use the Application Composer to change the fields on the Possible Duplicates page.

Create a sandbox with Application Composer.

1. Go to Navigator > Configuration > Application Composer > Sandboxes.
2. Click Create Sandbox.
3. Specify a name and select Application Composer All Tools. Also select the Publishable option as Yes.
4. Click Create and Enter.
5. Click the Application Composer icon.
6. Click Standard Objects > Account.
7. Click Pages.
8. Scroll down to Possible Duplicate Page Layouts.
9. Click Actions > Duplicate.
10. Provide the required information on the Duplicate Layout popup and click Save and Edit.
11. Make the required changes and click Save and Close.

Publish the sandbox.