If Windows Defender is missing and is gone or has disappeared in Windows 11/10, here are some suggestions that are sure to help you resolve the issue.

If Windows Defender Protection History is not showing, empty, or missing, you need to reset Windows Security. Open Windows Settings > Installed apps > Apps and locate Windows Security.

On Windows 11, the firewall, also known as Microsoft Defender Firewall, is a built-in security feature designed to protect your computer from unauthorized access over the internet or network.