There are many guides on the internet that indicate some procedures to delete the history of Windows Defender, many of them unfortunately do not work properly.
This is because for this type of operation (for now) you need to access the system externally, let’s see how.
We use advanced recovery options
To start the advanced options, follow this video carefully:
From the advanced options, choose Start command prompt, and then type:
of the "C:-ProgramData-Microsoft-Windows Defender-Scans-History-Service-DetectionHistory"" of the "C:-ProgramData-Microsoft-Windows Defender-Scans-mpenginedb.db"