The Renewal Policy tab of the Managed Certificates page sets the cadence for automatic renewal and the cleanup policy for replaced code-signing certificates.
This tab is shown only when Renewal Enabled is turned on, on the Settings tab. The settings here apply across all issuers. For the concepts behind these values, see Renewal and Retention.

Controls when Signotaur checks for, and renews, expiring code-signing certificates.
When Auto-unregister replaced certificates is on, the registration of a code-signing certificate that has been renewed is automatically disabled and then removed once its grace periods elapse:
A grace value of 0 means the action is taken on the next daily cleanup run after renewal. Only the registration is cleaned up; the managed certificate's history and key are retained. These values are defaults. A manual renewal can override them from the Renew Certificate dialog.
Controls when Signotaur checks for, and renews, the server's web (TLS) certificate. These settings apply regardless of which issuer signed the active certificate.
The Intermediate CA renewal threshold (Internal CA only) is configured separately, on the Internal CA tab.
Click Save to apply the policy. A confirmation dialog summarises the pending changes. Reset discards unsaved edits.