By Roman Loyola, Macworld.com | Mar 8, 2012
Spaces is a feature in OS X Lion that allows you to have multiple desktops, which can be handy when you’re working in more than one application and in different documents. Spaces is also handy if you have only one display to work with.
When you have multiple desktop spaces, most apps that are launched in a desktop space are dedicated to that space. For example, if you’re working at a coffee shop on your MacBook Air, you can have one desktop dedicated to Mail so you email is accessible immediately, and you can have a second desktop with a presentation you are creating in Keynote. You can switch between the two spaces when you need to do work in a certain app. (But some apps, like Adobe Photoshop CS5, don't behave when it comes to multiple spaces.)
In this tutorial, we’ll show you how to create additional desktops in Spaces in Lion. There are a few different ways to create new desktops, but they are all very easy.
Mission Control is an app used to manage your desktop spaces. The Mission Control icon looks like the icon at the top of this page.
To access Mission Control, just click on its icon in the Dock (it’s there by default, next to the Launchpad icon on the left side of the Dock). Since Mission Control is an app, you can also access it in Launchpad or in you Applications folder, or you can press the F3 button on your keyboard. If you have a trackpad, swipe up with three fingers.
When you open Mission Control, you’ll see two sections. The main section, which takes up most of the center of the screen, is Exposé, which shows your Mac's desktop and helps you find a window on your Mac. On top of Exposé are your desktop spaces. This is where you can manage Spaces. Available desktops appear as thumbnails; the first thumbnail is of the Dashboard, the second is of the desktop.
To add another desktop in Mission Control, move your cursor anywhere to the right of the desktop thumbnail. A pop-up with a + symbol will appear in the upper right corner of the screen. Click on it, and a new desktop will appear.