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

https://wiki-room.win/index.php/How_Do_I_Delete_Files_from_Grok_(The_Ones_People_Forget)%3F

To delete your Grok chat history, go to grok.com/app and clear conversations directly there. On X, remove chats by selecting and deleting messages from the thread