The View menu allows you to control the visibility of various windows and canvas options such as grid, guide and ruler.
This menu contains commands that show or hide the workspace's windows.
To zoom in/out, you can choose In (Ctrl + +), Out (Ctrl + -) commands or scroll the wheel of mouse. The below image shows three diffrent zoom modes: Actual Size, Window Fit, Width Fit and Height Fit.
The Ruler, grid and guide help you to edit. You can show/hide these you need. For more details about ruler, grid and guide, see the canvas.
This allows you to change the histogram mode. For more details, see the Histogram.
This allows you to start slideshow. For more details, see the Slide Show.
This allows you to chage the workspace for full-screen mode.
This allows you to open the option dialog box. For more details, see the Option.