I got 99 problems but my WiFi ain't one

Had another crack at NextDNS.

Android phone is a piece of cake. Although Business Insider on Chrome and Brave won't let me reject the cookie settings. But Forbes and the Daily Mail seem clean.

On my W10 laptop though when I try to change the browser settings on Chrome:

Google Chrome

1. Go to Settings.
   
2. In the Privacy and security section, click on Security.
   
3. In the Advanced section, enable Use secure DNS.
   
4. Select With: Custom, then enter https://dns.nextdns.io/somethingikdifishudhide
   

But when I get to step 3 I get Chrome telling me that:

This setting is disabled on managed browsers

...although my browser doesn't say it's managed.

Any ideas?