You can change them by using Smart Design Editor or by modifying the HTML source yourself.
Settings
1. Open the screen file on which you’d like to change the number of products displayed for each row in Smart Design Editor.
2. Bring a cursor over the module to edit and click Edit.
3. Find “<ul class=prdlist colum(number)"from the module’s HTML source.
4. The number next to “colum” is the number of products displayed for each row.
Enter a number between 3 and 5 and click [Apply].
5. Click [Save] to apply the changes.