Hello @Yianni A
Thank you for reaching out to Microsoft Q&A and informed us about the issue. Unfortunately, Microsoft Copilot does not support chat history feature across all platforms, you can manually scroll to past conversation but can't search through keywords. However, here's some workaround you can try:
- Use your device built-in search: If you're using Copilot via browser, you might be able to search text history through your device search bar
- You can copy and paste crucial part of your chats to your device's note or files to open it later
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