Want to check out your image with no distractions?

Just press the F key to invoke a Full-screen Preview.  Now you can see your image full-screen and hide all of the panels and toolbars. 

Image by Trey Ratcliff

You can still use the Cmd+Plus/Minus (Ctrl+Plus/Minus) shortcut keys to zoom in and check details. Just drag in the canvas to pan around.