in the driver's seat = in the driving seat
in charge of a situation
1998 - Times - The deal would propel the no-nonsense Lancastrian into the driving seat at the UK's biggest generator.
RELATED IDIOMS :
what someone is driving at
the point that someone is attempting to make
1986 - Robert Sproat - Stunning the Punters – Martin is always saying things where I can't see what he's driving at.
in the drivers seat :
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