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https://support.microsoft.com/en-us/windows/protect-your-pc-from-potentially-unwanted...

To turn on potentially unwanted app blocking go to Start > Settings > Update & Security > Windows Security > App & browser control > Reputation-based protection settings. There you'll find a control that lets you turn potentially unwanted app blocking on, and select if you want to block apps, downloads, or both. Why don't I see this?

https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/detect-block...

The potentially unwanted application (PUA) protection feature in Microsoft Defender Antivirus can detect and block PUA on endpoints in your network.

https://docs.microsoft.com/en-us/deployedge/microsoft-edge-potentially-unwanted-apps

For a description of the criteria used to classify software as a PUA, see Potentially unwanted application. Protect against PUA with Microsoft Edge. Microsoft Edge (version 80.0.361.50 or later) blocks PUA downloads and associated resource URLs. You can set up protection by enabling the Block potentially unwanted apps feature in Microsoft Edge.

https://support.microsoft.com/en-us/windows/protect-your-pc-from-unwanted-software-074...

Microsoft Defender Antivirus tries to block malware before it can infect your device. Potentially unwanted apps (PUA) aren't malware, but they might display advertising, use your PC for cryptomining, or do other things you'd prefer they not do.