The Avira Antivirus “Quick Scan” is enabled by default and cannot be disabled or deleted in the long term.
From the time of the Antivirus installation, the "Quick scan" performs regularly every 7 days a system scan in the background. This way can be ensured a maximum protection against malware.
Note
The "Quick Scan" can be temporarily deleted under Scan → Scheduler → Scheduled Scans. However, with the next update of your antivirus, the "Quick scan" is automatically reactivated.