Standard view in task list has built-in, always on conditional formatting when a task’s assignee impacts the timeline, rather than a one-time error message (see screenshot) saying they have PTO that then shifts out the whole project timeline. For example how it should work ideally is when you make an assignment and the timeline shifts, the impacted dates turn blue. If you swap out the assignee for someone without Time Off, the dates shift back to black text, white background.
