Users can generate long term tokens to connect to the chat. These tokens can for example be used to include the chat in OBS web docks. Check <a href="https://livingston.frama.io/peertube-plugin-livechat/documentation/user/obs" target="_blank">the documentation</a> for more information. You can disable this feature by checking this setting.
Default value for new chatrooms. For existing chatrooms, you can change the feature in the room configuration form. When this feature is enabled, anonymous users can only read the chat, and not send messages.