|Slide Shows - Settings and Controls|
To set the amount of time the image remains on the screen, select a Delay Between Slides amount.
To set the slide transition style, click one of the Transition radio buttons.
To set the relative frames per second, use the Speed slider.
To apply these settings to all subsequently created albums and Library Trees, click the Set For All New Docs button.
To start the slide show, choose View -> Slide Show (Command-L).
To stop the slide show, double-click or press the Space, Delete, or Escape keys.
To manually control the slide show, click the mouse button once to enter manual mode. Then use the Arrow keys to move through the images. Click the mouse button again to reenter automatic mode.
To go as quickly as possible through the images, hold the Shift key.