You can disable Gemini Apps Activity and delete past conversations
Because conversations and prompts are kept for up to three years by Google, the company says, “Please don’t enter confidential information in your conversations or any data you wouldn’t want a reviewer to see or Google to use to improve our products, services, and machine learning technologies.”
To turn off Gemini Apps Activity, go to your mobile or desktop browser and head to myactivity.google.com. There, you can also delete past queries you made of Bard and Gemini and toggle off Gemini Apps Activity.
In case you were wondering why Google has humans review Gemini conversations, the company says, “Google uses conversations (as well as feedback and related data) from Gemini Apps users to improve Google products (such as the generative machine-learning models that power Gemini Apps), so we can make them safer, more helpful, and work better for all users.”