When you first open your project, you’ll probably see red “minus” icons to the left of most Categories and Deliverables. By default, all projects display with any embedded activities open, which is why you see the red minus icon.
To hide any embedded tasks or deliverables, click the minus icon and a green plus will appear.
Here’s an example of how you’ll see projects when you first open them (with all embedded activities visible):
Here’s an example of the same project with most of the activities closed: