At the end of Captain Marvel (2019), Carol left C-53 and greets Mar-Vell's Laboratory with the Skrulls aboard:
What is Talos' signal to Carol?
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He's telling her they're about to turn around and set off. If you watch the scene below you can see that the front of Mar-Vell's Laboratory is pointed towards Earth with Carol having her back to it. Carol then turns around to look at Earth one last time and you see the Laboratory turning around in the background. When she looks back towards it, it has turned around completely and they are ready to set off now facing away from Earth.