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I want to create Admin account

Hello,
I want to create a specific user(Admin) who can see everything but instead of Admin, nobody can’t see their customers.

I’m not sure what you mean by your last sentence, but what you would typically do with User privileges (like admin privileges) is to assign some field on the User that provides that status.

One way to go is a yes/no field (Admin = yes), or a text field (role = admin), alternatively use an Option Set (role = Option set value).

This way you can build Privacy Rules and/or conditions around that field.