Final answer:
The Gantt view requires two date columns for display, one for the start date and one for the end date of tasks, to visualize the project schedule effectively.
Step-by-step explanation:
The view that must include two date columns in order to be displayed is the Gantt view. A Gantt chart is a type of bar chart that represents a project schedule. To properly display a Gantt chart, it is necessary to have at least two date columns: one for the start date and one for the end date of each task. This allows the visualization of tasks over time and helps in tracking project progress. Without both start and end date columns, the Gantt chart cannot accurately represent the time span of the tasks involved.