To insure that worlds are legally following the Traveller5 rules and will be displayed by Traveller Map, changing parameters starting with Starport should be done in the order shown, from top to bottom and then the right column from top to bottom. This is because parameters often depend on other parameter's values, and when you change one parameter, the app will randomly regenerate all the dependent parameters "below" it to ensure legality.
Trade Codes are generated automatically but there are optional remarks that may be added like Subsector Capital in the example shown below.
The only data that can't be regenerated is Stellar Data for the system. What you get is what you have.
The Recycle buttons let you randomly regenerate a parameter, giving you some control but making sure you get a legal result.