

Keep in mind that any changes you make to one Gantt Chart view does not change the look of another Gantt Chart view. For example, you can change how nonworking time is displayed, or you may want to format a Gantt Chart view to quickly identify specific tasks, or perhaps you want to add text to specific bars to help you identify them. You can customize the chart part of these views in Project to better suit your needs. Gantt Chart views allow you see, at a glance, task information in a columns and rows with corresponding bars along a timeline. Overview of formatting the Gantt Chart view

Customizing the bars on a Gantt Chart view is often the first thing a project manager does to create clarity in a project and to help spot problem areas quickly. Gantt bars look simple enough, but they can get confusing as projects get complex.
