That fill-in is gone - it may have been taken out of the template.
It goes in the subject, details or a task as [], and the answer takes its place. Renaming it renames it there too.
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One per line. A task can be for one of them only - set that on the task.
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Not for tickets a project template raises - those are answered on the ticket.
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On the client portal's request form, and they see the answer on their ticket. Off, it is for agents to answer.