In the editor, the gear beside the generated short link opens Link Settings. The inspected dialog includes Allowed Scans. It states that the QR code will stop working when its allowed-scan limit is reached.

This per-link control is separate from the subscription’s overall scan allowance. Review both when investigating a code that has stopped opening.

Do not assume that a blank, zero, or unusually large value has a particular meaning without confirming the current configuration. Contact support if you need help choosing or interpreting a limit.