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Microsoft 365 and Office | Microsoft 365 Defender | For home | Windows
An integrated threat protection solution designed to detect, investigate, and respond to cyber threats across Microsoft 365 services.
This usually means Defender or Chrome noticed that something may have changed your browser settings, such as the default search engine, homepage, startup pages, or extensions.
That said, a screenshot alone can't guarantee it is genuine, since a webpage could imitate a Chrome dialog. The safest option is:
Click Cancel on this prompt.
In Chrome, type chrome://settings/reset into the address bar yourself.
If you want to reset Chrome, choose Restore settings to their original defaults there.