You have flexibility in which foods you choose, but the amount still matters. The regular meal is part of the plan’s daily intake, not an unlimited meal outside it.
Use the app’s portion guidance, include a protein source and make space for foods you enjoy. In a restaurant, you can choose a meal that suits you and stop when comfortably satisfied rather than trying to finish a large portion automatically.
If your result page shows room remaining after the products, remember that recipe additions, drinks and other food also use that room. You do not need to turn the meal into a calculation exercise, but it helps to understand the whole day.