Welcome to the Forum @steph.west.harp
This has been requested before. We can hope that in a future version of Dorico there would be an option to ignore/overwrite the piano-fingering-auto-order.
See this thread Fingering Orders, in post #2 @Romanos explains how to enter fingerings one by one, that imho is a better (more stable) option as to move them in Engrave mode.
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