The presets are at the bottom of the main window and represented as a sequence of frames. Each frame is a thumbnail of generated picture on a solid/transparent background (New Image mode) or on a loaded image (Open Image File mode). If all presets can not be displayed in the presets list, a forward button > will appear at the right of the presets list, when you're moving your cursor over it. You can use this button to get an access to the presets which are not visible at the moment. You can return to the beginning of the preset list, by pressing the back button <. It is at the left of the presets preview area. For moving along the presets list, you can also use the horizontal scroll bar, which is at the bottom of the 'Presets' panel.