This section of the interface, entitled „General settings”, refers mainly to the dimensions of the show. You can modify them by inserting the desired number (of pixels) in the adjacent text boxes.
Two other options you can enable here are the shuffling and looping ones; in order to do that, just check the check-boxes adjacent to the corresponding text. Shuffle will arrange the slides in a random order, and loop will make your show start again - when its finished - in an endless cycle.
If you want to see how your show looks like, at any time, press the Preview button.
The General Settings section