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

https://domgodwinson38.gumroad.com/p/what-is-private-chat-in-grok-and-does-it-save-history

To delete your Grok chat history on grok.com/app or X, go to your chat settings and select ‘Delete History.’ Remember, this only removes conversations. Any files or Imagine media you shared need to be deleted separately from their folders