Look for the dividing line which appears a little bit to the left of the Trash.
The Dock is divided into two, disproportionately sized sections.Apple populates the Dock with items that they think, or want, you to use, but you can customize it to suit your own needs. You can add applications, documents or folders to the dock. The Dock is the row of icons that’s typically located across the bottom of the screen, though it can be moved. Would you like to add frequently used applications or documents to your Dock? Would you like to remove rarely used items from the Dock? If so, below are instructions on how to do this.
