Hello @elkemoshel ,
Thank you for the info about the duplicate functionality in the Sales CRM.
Also, if anyone is looking for a full-fledged duplicate managment system that can be used in any monday product and in the monday core product itself, which can automatically handle (merge, mark, delete, move) duplicates, they can check out the Duplicates and Uniques app.
Here is a community post which further describes the app.
@Michaleiba you can check it out. It does exactly what you are looking for.
If you have any questions about the app, you can always reach out at support@kolaai.com