As you might have already noticed, in Windows 10 version 1511, Microsoft implemented a context menu item for Windows Defender. Now it is possible to scan selected files and folders in File Explorer with one click by right clicking and launching Windows Defender. If you do not want this "Scan with Windows Defender" verb/context menu item, here is how you can safely remove it.
In Windows 10, it is possible to make the Windows Defender notification area (system tray) icon visible. If you are a Windows Insider, it might already be visible in your installation. In this article, we will see how you can show or hide the Windows Defender tray icon in Windows 10.
The recently leaked Windows 10 build 10051 features the updated Windows Defender application with a new Settings button:
Refer to the following article for more details: Disable or enable Windows Defender in Windows 10