Tap on the preferences icon (see icon list above) in the main application to access these options:
In the 'Start with' selection box you can select if you want to see a list view of images, a icon view of images, or a new sketch when you open the program up.
If joypad scrolling is enabled you can move the page scroll bars around in the sketch with the joypad.
If grow on scroll is enabled the sketches dimensions will get bigger as you scroll from left to right or top to bottom and vice-versa.