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

https://www.sierrabookmarking.win/to-delete-your-grok-chat-history-go-to-grok-com-app-or-use-the-x-platform

To delete your Grok chat history on grok.com/app and X, go into your chat settings and select ‘Delete History.’ Remember to also remove any files or Imagine media separately, as they aren’t included in chat deletion