ChatGPT usually lets users manage chat history from the sidebar or account settings, depending on the platform and current version. If chat history is available, you can often open a conversation and delete it directly from the menu beside that chat. Some versions also include an option to archive conversations or turn off chat history and training in settings, which prevents new chats from being saved in the usual history view.
If you want to remove all stored conversations, look for a data controls, privacy, or settings section in the account area. That is where ChatGPT commonly places options for clearing history, exporting data, or disabling history going forward. If you are using an organization or enterprise account, the available controls may be different.
Because the interface can change, the best place to check is the current page or account settings for the exact menu labels. If contact information is provided there, that would be the place to find help for account specific issues.