You can change coach whenever you like, from your coach profile. Each one has a different way of working and a different voice — that is the point of having a roster rather than a single personality.
What carries over: your training history, your plan, your races, your thresholds. None of that belongs to a coach.
What changes: how you are spoken to, and what your new coach chooses to emphasise. What your old coach had learned about you is carried across in summary rather than verbatim, so expect a short settling-in period where the new one asks about things the old one already knew.
Switching does not rewrite the plan you already have.
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Where this lives in the app: Your Coach