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You can remove your payroll subscription directly from the Manage Service Key window.
But if you wish to cancel and remove your payroll subscription, you can do it directly from the Account Management Portal page.
Here's an article you can read to learn more: Manage your QuickBooks Desktop subscriptions and services.
I'm adding this helpful article for ideas in managing your account and transactions: Help Articles for QuickBooks Accountant.
Reach out to me if you need anything else. Thanks!