Selecting the Photo Library Activity from the Navigation Panel displays the Photo View (4), the Photo toolbar (1), the Zoom toolbar (2), the Slideshow toolbar (3), and the Photo Library menu in the menu bar, as shown below.

Photo View
The name of the selected folder displays in the photo view header bar (5), and the photo image files in the selected folder are displayed as thumbnail images at the bottom of the view horizontally (6). The current Photo image (7) displays in the client area of the view in the size specified by the Zoom toolbar (2). You can increase or decrease the size of the thumbnail area by dragging the divider (8) up or down in the Photo view.
Photo Toolbar
Various functions are provided in the Photo View toolbar (1) to add and manage your Photo image files, including Open, Add Photos, Cut, Copy, Paste and Delete button actions.
Further reading from Photo View: