Can't dismiss the "Easily migrate your data" message [Known Issue]

Hi panhandler - I'm sorry to hear about this. Any items migrated via this prompt should have been placed in their own vault. Do you see a vault namedImported defaultin the sidebar of 1Password for Mac? I'd recommend making a quick check to see whether any new non-migrated items have been saved there by mistake since the migration took place, then deleting the items from within that vault.