To schedule a Task over multiple days, drag the start of the Task to Calendar. If the Task overlaps multiple days, you will see the vertical line shown below at the end of the working day (the first image below). This shows that the Task overlaps multiple days.

You can see the Task on the next working day with a vertical line above it (the second image below).

If you want to reschedule the Task, go to the first day on which the Task is scheduled and drag and drop the Task to a new location on the Calendar.