I told another user how to do this. Now I'm telling the rest of y'all how to add the No A.I. version of Duck Duck Go to be your default search engine, if you're using Firefox or a FF fork such as LibreWolf. Here are my instructions:
FF >>> Settings >>> left column, "Search" >>> scroll down, "Search Shortcuts" ... click "Add >>>
"Search engine Name = No AI DDG
"URL"= https://noai.duckduckgo.com/%s
"Keyword" = "[octothorpel]NAIDDG" [I left this blank 'cause it don't matter that much]
click "add engine"
Scroll back up to "default search engine" and switch to your newly added "NoAIDDG"
Test seach "pink is my favourite colour"
Until there's something better ...