Steps
Open the organization menu, select My profile and open Out of office.
Under Who covers for you, choose your deputy.
Set your first and last day away. The dates start from today, and you can change them.
Select Set out of office. A banner confirms who is covering your open tasks and pending approvals, and until when.
While you're away
Your deputy finds your open tasks under Assigned to me and your approvals under Waiting for my approval.
The task still names you as the assignee, with a note that your deputy is covering for you.
Your deputy can complete or approve the task, and the activity records that they did it while covering for you.
Your deputy doesn't need extra permissions. Their access comes only from covering for you.
Ending out of office
Out of office ends when your last day away has passed, or when you select End out of office. Tasks your deputy completed then leave their list.
An administrator can also set out of office for a colleague, from the menu next to their name in Users.