Bulk changes to tasks

select the checkbox to the left of each task that you want to change

List of tasks showing two that have been selected for change — Select tasks to change

select the bulk change option from the tasks menu

The tasks menu dropped down showing the bulk change options — Tasks menu selected

There are 3 options:

Assign user. Assign a user to all of the selected tasks
Delete selected. Delete the selected tasks.
Set selected as assigned. The task may have been marked as completed or rejected by a user using this option the task is marked as assigned back to the user so that they can re-do it.