To delete your Grok chat history, go to grok.com/app and clear your chats...
https://source-wiki.win/index.php/Where_is_the_Delete_All_Conversations_Button_in_Grok_Settings%3F
To delete your Grok chat history, go to grok.com/app and clear your chats there. On X, delete messages directly in the conversation. Remember, files and Imagine media aren’t removed this way—you’ll need to delete those separately