To delete your Grok chat history on grok.com/app and X, go to your chat...

https://www.stall-bookmarks.win/to-delete-your-grok-chat-history-go-to-grok-com-app-and-clear-conversations

To delete your Grok chat history on grok.com/app and X, go to your chat settings and choose “Delete History.” Remember, this clears only chat messages—files and Imagine media must be deleted separately