https://www.bleepingcomputer.com/news/software/chrome-saying-its-managed-by-your-organization-may-indicate-malware/

Recently users have noticed that Google Chrome has started stating that it is "Managed by your organization" when they open the browser's menu, which is a confusing for home users who are not part of any organization. It turns out that with the release of Chrome 73, the browser will now display this message whenever a group policy is configured for the browser.

Google allows administrators to create policies that control how Chrome operates on a computer. These policies are designed to make it easier for admins to manage the Chrome settings for all users in their organization.