https://www.entrepreneur.com/article/377951

WhatsApp has made a change with a view to improving the experience of its users in group calls and video calls . The platform now allows guests to enter these at any time while they are still in progress and not only at the time of receiving the notification, something that could not be done before.

Before, if you ignored the invitation to a group call, WhatsApp prevented you from joining later. Now,. the conference will remain open accessible with a direct access in the WhatsApp chats, and you will be able to "leave and re-enter whenever you want" for the duration of the communication and as long as the participants do not withdraw the invitation.