This change applies to Lightning Experience in Essentials, Professional, Enterprise, Performance, Unlimited, and Developer editions.
Let sales reps share their workload by setting up queues for tasks. Reps can assign tasks to their shared queues, and then individuals can take ownership of those tasks from the queue’s list view.
When reps assign tasks to a queue, those tasks are available to members of the queue, which means everyone can pitch in to help. No more relying on one sales rep to do it all. Now others on the team can lend a hand without waiting for work to be delegated or reassigned.
How to Setup Queues:-
First, go to Setup then in Quick Find Box type Queues and then select Queues. From the Queues setup page, select New. Then, create a queue and select Task as the supported object and select users to whom you want to assign a Task.