How can I manage chats?

Do I want to be able to delete chats? All chats at once or one line of chat
How can I do this?

Thanks

who can help me???

Once everybody leaves the room, all chat history is deleted.
Chat edit is not supported at the moment.

Hi,
Isn’t it possible to program this because it is very necessary for us

You will need to add changes in lib-jitsi-meet to support that and modify jitsi-meet to add UI for it.

You can implement XEP-0308: Last Message Correction in lib-jitsi-meet

Is there a way to delete all chats with one command?

There is no such feature locally, and I’m not sure xmpp has defined an option to manipulate history of the room if you want to do sync that with other participants …