Automatic shifting of deadlines

If I modify the deadline date for a parent task, all of the sub-tasks automatically change their dates to correspond with the new timeline. However, I don't always need that feature. Today, I need to change the deadline for a parent task but NOT for the subtasks. How can I update a parent task"deadline" without all of the subtask deadlines changing automatically?

IE: I have a parent task with a deadline of yesterday so it is showing past due. However, there are several subtask underneath with deadlines through December 31. THe parent task deadline date is wrong (not sure how that happened) but when I try to change it's deadline to accommodate the sub tasks that are due later this year, ALL of the subtask deadlines shift as well.

How do I "deactivate" that feature until I get my parent task deadline corrected?
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