"Serving" is ultimately a bit of an ambiguous term and will vary recipe to recipe. Our generator will determine the number of servings for each meal based on what works best with your nutrition targets. When you click on a recipe in your meal plan, the ingredient amounts are already scaled to the number of servings planned for your meal. So, as long as you follow the recipe in your meal plan that's been scaled for you, you'll end up with the correct serving size for that meal.
You can always click on a recipe and adjust the number of servings, and the ingredient amounts will automatically be scaled up or down accordingly. If you click on the serving drop-down, you'll have the option to convert this to grams, which will total up the number of grams in each ingredient. You can also select the View Original option to scale the recipe back to its original version.