To clear outdated details from Claude's saved memory, first check which settings page your account has. Under the newer Settings > Memory, deleting a conversation leaves its memory entries in place. The legacy Settings > Capabilities system removes deleted conversations from its memory synthesis.

If your account has Settings > Memory, open Topics and read the relevant entries. Delete what you no longer want saved, or edit an entry to correct it.

Source: https://support.claude.com/en/articles/11817273-use-claude-s-chat-search-and-memory-to-build-on-previous-context