If you want to turn on Windows Defender on or off using Windows Settings, follow the steps given below:

1. First of all, open Windows Settings (Windows Key +I)
2. Then, Go to Update & Security > Windows Security
3. From the right-hand pane, choose Manage Settings under Virus & threat protection settings
4. The switch to Off under Real-Time Protection.

This will Turn Off real-time protection while the manual scan will be available at your disposal.

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