The beta version of the WhatsApp messenger for Android and iOS mobile platforms has a function of automatically disappearing messages in group chats.
In the new version of WhatsApp 2.19.348 for Android smartphones, the Disappearing Messages button has been reformatted to Delete Messages. In the current version of the mobile application, you can only delete messages manually.
As noted by the developers, the new feature appeared only in group chats.
Disappearing messages will free the phone memory of old messages. Only conversation administrators can enable this feature. They will also determine when the messages are deleted. It will not be available to regular members of the group.