Direct controll of what exacty is done it by internal computers in the spaceship. That is how it has been done since the beginning of spaceflight.
Ordes can be given to what the spaceship should do in the future by radion links to it. It can be from groundstation that will be limited by where they are on earth. It can also be done by using satellites higher up as relays. I do not know exactly what Space X are using, the did use Starlink for the video stream in the latest Starship test.
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