Vivaldi browser natively supports DNS-Over-HTTPs. Let's configure ControlD on it.
Open a new tab and navigate to this URL: chrome://settings/security (you will have to copy and paste it)
Under “Use secure DNS”, select “With Custom”
Input the DNS-Over-HTTPS URL into the field. If you're configuring our free DNS resolvers, you can use these:
If you are configuring a custom DNS resolver, you can find your DoH URL in the My Account section.