You can edit the reference date of a started checklist to reschedule all its tasks. To do so:
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Go to the template of the checklist to reschedule.
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Locate the relevant checklist and click on the button with the three vertical dots
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Click on Reschedule Checklist
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A window opens, select the new reference date in the calendar
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Click on Reschedule
Note that only tasks that are still open tasks will be rescheduled.

