Based on your description, I understand that you want to remove barcodes in the site collection.
1.Go to list or library settings -> Information Management Policy Settings -> Select the content type -> Unclick Enable Barcodes.
2.Use PowerShell to remove columns "Barcode", "Barcode Value", and "Exempt from Policy".
Reference:
https://social.technet.microsoft.com/wiki/contents/articles/5207.sharepoint-2010-powershell-script-to-remove-the-columns-barcode-barcode-value-and-exempt-from-policy-when-removing-irm-policy-in-a-list.aspx
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