Wendy's has a set menu that offers various sides, including fries, salads, and baked potatoes. However, the restaurant does not officially support custom side orders when selecting items. Customers can choose from the available sides on the menu, but they cannot create entirely new combinations or request specific modifications to sides that are not part of the standard offerings. It is worth noting that occasional promotions may allow for unique options, but these would still be limited to what is outlined in those special offers. For the most accurate and current information on available sides, customers can visit the Wendy's website or consult the menu at their local restaurant. Wendy's aims to provide a consistent experience, hence the limited options for custom side orders.