To access the Google AI Mode home screen, visit google.com/ai.
A disclaimer under the search box may appear, stating:
Based on your Google activity. However, this only seems to show when signed into a Google account, as Google requires access to past activity history.
Google AI Mode utilizes search history and conversation history, likely to resume chats where they were left off.
A default suggestion on the AI Mode page is also labeled as
Based on your Google activity.
Note: The author is currently offline for Simchas Torah.
Author's summary: Google AI Mode uses user activity data.