Inspectors
The inspectors are floating windows which contain information and controls related to what's selected in the main window. If you don't see them, click the Inspect button 
in the toolbar, or pick one from the Inspectors menu. You can show and hide an inspector's various sections by clicking the icons at the top of each inspector window. Hold Command while clicking to open an inspector section without closing the ones that are already open.
in the toolbar, or pick one from the Inspectors menu. You can show and hide an inspector's various sections by clicking the icons at the top of each inspector window. Hold Command while clicking to open an inspector section without closing the ones that are already open. The Project inspector has information about the document as a whole.
Project Information — General info about the project as a whole, such as its title and if the document works form a start date or an end date. Also, home to the scheduling granularity setting. 
Project Milestones — Manage milestones, their styles, and adjust their slack limit. The slack determines how much the project can fall behind without impacting the deadline. 
Project Styles — Change the style of tasks and resources. 
Project Colors — Change the color of backgrounds, rows, columns, and separators in the various outlines and charts. 
Project Formats — Configure your time and currency units. 
Project Unit Conversions — Define the hours in a given work day, week, month, and year. Click the Edit Work Week button to go to Calendar View to make adjustments to your hours. 
Project Custom Data — Store any kind of miscellaneous data about the project. 
Project Attachments — Link to important files related to the project. The Task inspector has information about the currently selected tasks or milestones, so it's available only when the main window is in task view.
Task Information — General info about the selected task, such as when it's scheduled and how long it'll take. Task Schedule — Info about the selected task's schedule, for example when it's assigned for completion, when it was actually completed, or split. Task Dependencies — A list of the dependencies this task is involved in. Task Assignments — A list of the resources assigned to this task. Task Custom Data — Store any kind of miscellaneous data about the task. Task Attachments — Link to important files related to the task. The Resource inspector has information about the currently selected resources, so it's available only when the main window is in resource view.
Resource Information — General info about the selected resource, such as how much of it is available and how much it costs. Resource Assignments — A list of the tasks this resource is assigned to. Resource Custom Data — Store any miscellaneous data about the resource. Resource Attachments — Link to important files related to the resource.