If you never want to see #AI suggestions in your #DuckDuckGo search results without having to store a cookie from them, just add "kz=-1" to your quicksearch or bookmarklet URL, like so:
https://duckduckgo.com/?kz=-1&q=%s
More info about their URL parameters at https://duckduckgo.com/duckduckgo-help-pages/settings/params/