Users with the Manage Workflows role can administrate the workflow delegation. Go to Administration > Workflows > Workflow Delegation to display a table with all the delegations.

As an administrator, you can:

Create a delegation for any source and target user in the partition.
You can do this also for inactive users and this way delegate approval tasks of users who have left the company.
Delete or terminate ("EndDate") any existing delegation.
Create a filter that will narrow down the list of users available for delegation.

See also Workflow Delegation.

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