How can I extend the response due date for my launched initiative

Summary:

I created an initiative.

In Overview tab, I selected a qualification area, selected a supplier and an internal responder.

In Questionnaire tab, I put a Due Date, populated the First, Second and Past Due Reminder.

Then I launched the initiative.

Problem: I need to change/extend the date of Response Due Date, how can I do it? When I searched for the initiative, I can no longer edit the Response Due date field.

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