Set duckduckgo as default search in Vivaldi browser and also search from addressbar

Set duckduckgo as default search in Vivaldi browser and also search from addressbar

Today I install Vivaldi on my machine. and Vivaldi is just amazing at least from the user interface point of view and the highly customizable feature that is provided by Vivaldi. The browser is based on Chromium. And everything is looking nice and good until I did not find a solution that I face in Vivaldi. 
As I use duckduckgo as my default search engine in my most of the browser and I do the same in Vivaldi. But when I am trying to search something from the address bar, it took me to the duckduckgo site but not searching anything. 
So I have dome some search work but nothing found that can work for me. then I just do a trick that google use it search URL. 
https://www.google.com/search?q=%s
the %s tag that google use to search something from its URL. 
so I just add that %s at the end of duckduckgo URL and it just works like a charm.

something like this,

https://duckduckgo.com/%s

Set duckduckgo as default search in Vivaldi browser and also search from addressbar

I hope this will work for you too.

Thanks for reading and have a nice time.