There are two ways that you can remove due dates that have been set for Items:
From within the Item
1. From inside the Item, select the workflow status
2. Select the due date for the workflow status that you want to remove
3. Click 'Remove due date'
This will immediately remove the due date for that workflow status. Users will not be notified of this update.
From the Content tab
1. Go to the Content tab
2. Select the Items using the checkboxes at the side, click the actions drop-down button that has appeared, and then select 'Set a due date'
3. Select 'set a due date'
Select the due date for any of the workflow steps.
4. Click 'Remove date'
This will immediately remove the due date for this workflow stage for all of the selected Items. Users will not be notified of this update.