Show field if record isn't new.

How can I hide a field when the form is creating a new record and show it when the user is editing a record? I’ve tried the following for show if conditions:

IsNotBlank([Id])
IsNotBlank([_Row_Number])
[_ThisRowBefore].[id] = [_ThisRowAfter].[Id]

None of these seem to be the right answer. Thanks in advance!

Please try below expression in show_if of the field

IN([Table_Key_Column], Table_Name[Table_Key_Column])

Thanks Suvrutt!

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You are welcome.