The Status app is currently in its beta stage. This means the application is still undergoing active development, and certain features described in this document may function differently or be unavailable within the app.
If you don't need a group chat any more, you can delete the chat. Once you do that, the chat history and member list are gone forever, with no way to recover this or any other data.
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Only the group chat owner can delete the group. If you're a regular member, consider leaving the chat instead.