Salesforce Duplicate Management is a feature that detects and alerts users when they attempt to create or edit a record that may be a duplicate of an existing record. When a duplicate is detected, Salesforce displays a Duplicate Alert banner that shows a list of potential duplicate records.
The fields shown on the Duplicate Alert and in the "View Duplicates" window can be customized using the Search Layouts configuration in Setup. This applies both to Salesforce Classic and Lightning Experience.
This article explains how to add or remove fields displayed in the Duplicate Alert and View Duplicates window for an object, such as Accounts.
To customize which fields appear in the View Duplicates / Duplicate Alert window for an object (for example, Accounts):
Note: Changes to Search Layouts affect the fields displayed in the Duplicate Alert window as well as in standard search results for that object.
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