As I said before: "I think you want Spaces - probably in your Dock but if not it should be in Applications".
I see that you have aliases on your Desktop to things which should be in the Dock. See About the Dock help file below:
About the Dock
By default, the Dock appears at the bottom of your screen. You use it to open applications, documents, folders, and more.
The Dock comes with icons for some applications; you can add others. When you minimize a window or open an application that isn’t in the Dock, it appears in the Dock.
The Dock contains a Downloads folder, where anything you download from the web can be saved. Safari, the web browser that comes with your computer, places downloaded items there automatically.
You can add more folders to the Dock. Folders in the Dock are called “stacks.” A stack can be a handful of documents, a group of applications, or a set of folders—anything you need to access frequently. When you click a stack, it springs open in an arc or a grid, depending on the number of items.
The Dock provides several useful shortcuts:
- To open an item in the Dock, click its icon.
- To open a document using an application in the Dock, drag the document icon to the application icon.
- To view a menu of options for the Dock, first locate the gap in the Dock between the row of application icons and the Trash. Then hold down the Ctrl key and click within the gap.
You can customize the Dock by changing its magnification, repositioning it, and more. To
change Dock preferences, choose Apple menu > Dock.