How do you get ride of the side bar?

Here is the picture, it's really self explanatory. How do I get rid of it so I only view the folder?

see the picture

BisVal said:

see the picture

Thankyou good sir.

So you and others know, those folders are shown on that Explorer bar so you can easily drag any folder into them or one of their subfolders, holding onto the left click/drag operation until hypertext confirms where you are copying them. This offers great convenience for copying and moving files.