Here's where Google (barely) exposes an option called "Signed-out search activity" retention: https://www.google.com/history/privacyadvisor/search https://www.g

Here's where Google (barely) exposes an option called "Signed-out search activity" retention: https://www.google.com/history/privacyadvisor/search https://www.google.com/history/privacyadvisor/search Make sure to access it while not signed in to Google, but using a browser mode which persists cookies (ie, not incognito mode). The actual control is https://www.google.com/history/optout https://www.google.com/history/optout Here's the equivalent for YouTube signed-out watch and search history: https://www.youtube.com/feed/history https://www.youtube.com/feed/history . Click "Clear All Watch History," then click "Pause Watch History," then choose "Search history" and repeat those 2 steps again. Do all of this from each device you use Google or YouTube from.