You can turn off payroll in QuickBooks Online (QBO). Let me guide you how.
Click the Gear icon, then choose Account and Settings.
Click Billing & Subscription.
In the Payroll section, click Cancel.
Click Continue to cancel.
Complete the short survey and select Confirm cancel.
However, if you need the accounting services that QuickBooks offers, then QuickBooks Online Payroll would give you access to everything you need. But if you're only looking for payroll services, then Intuit Online Payroll may be the best option if you take care of bookkeeping and accounting on your own.