Each of your Nutrition Profiles can also have a limit on sodium and cholesterol, as well as a minimum target for fiber.
To edit these, start editing one of your nutrition profiles (more info here: How to change your nutrition targets, or add new Nutrition Profiles )
When on the editing popup for a nutrition profile, scroll to the bottom to the button that says "Show sodium/cholesterol/fiber targets". Click on this button and it will show you the settings. Select what you want, and then regenerate your meal plan to get new suggestions.