This setting tells how many subcategories are to be shown at first. If the list of subcategories is longer than this value the extra ones will be hidden and a "View More" option will be shown instead, allowing the user to display the hidden subcategories. a "View Less" option will be available to provide the full "accordion" effect. If you set it to zero ("0" without quotes) it will hide every subcategory and a plus sign will show next to the category name, clicking the plus sign will show that category's subcategories.
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