Hide, disable, remove Windows Defender icon from Taskbar Notification Area. If the icon shows even when you have 3rd-party antivirus software installed, this post will help you.

If you wish, you can show the Windows Defender icon in the Windows 10 system tray. To make Windows 10 display the Windows Defender: Click on Start button to open Start menu; ...

The Windows Defender icon only appears when spyware is detected or when a scan or update is in progress. The default settings for Windows Defender take an automatic approach.