Solution :
:set- In this list of options find the entry with the default DDG and change it
:save
The reason I had trouble starting to find the solution is because qutebrowser is not using a configuration file by default (from version 1.0 or something onward) and I got lost in the qutebrowser help which has countless entries. Thanks to the Arch Linux wiki I figured out more.
As the person before me wasn’t greatly helpful (gave a website but that’s it. You will change url.default_page to something that isn’t https://start.duckduckgo.com/