To delete your Grok chat history, go to grok.com/app and clear conversations...

https://extra-wiki.win/index.php/How_Do_I_Verify_Grok_Files_Are_Really_Gone_After_Deleting_Them%3F

To delete your Grok chat history, go to grok.com/app and clear conversations directly from your chat list. On X, use the app’s settings to remove any linked chats