If you are using the basic account tier, all menus and menu items are locked to two servings. If you are subscribing to a paid tier you can change servings on menus by clicking the "Servings" icon for each item in the menu or by entering the amount of servings in the field next to the menu title and then clicking save. This will recalculate the ingredients and nutrient values for the entire menu including the shopping lists, ingredients and nutrient values if you choose to download a PDF of the menu.