While it’s recommended to keep auto-renewal enabled to prevent domain expiration and website and/or email downtime, you may disable the auto-renewal feature at any time. By disabling auto-renewal, your services will not be automatically renewed upon expiration using your added payment method.
Auto-renewal is now managed via a toggle switch on the subscription row. To do so, go to the Billing section in your hPanel, then go to Subscriptions, click the toggle to disable auto-renewal for each service individually.

Carefully consider the warnings about the possible risks, and if you still wish to disable auto-renewal, continue with the process.
NOTES
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Disabling auto-renewal doesn’t affect the status of your current services. They will remain fully active until their expiration date
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If you wish to change your billing cycle, you need to have auto-renewal enabled
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Disabling auto-renewal will not revert already applied charges