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1 Click Tools at the top of the Windows Defender Window. 2  Click Options in the Settings section of Windows Defender. 3  Click Default actions.  Set the default actions (recommended action based on definitions, Remove, or Quarantine) for each level of alert and then click Save.
&nbsp Windows. If you try to turn off Windows Defender in Windows 10 the same way you did it in Windows 8.1 by opening its Settings, you will not be able to do so. The only option available is to disable Real-time protection for a while and then (approximately after 15 minutes) Windows Defender turns on again. But there is a way to disable it permanently if you wish to do so for some reason.