Where are the coordinates of the player's initial position listed?

[L.F.A]

The code for selecting Lyra player starts resides on
LyraGameMode.h
LyraGameModecpp
LyraPlayerSpawningManagerComponent.h
protected:
// Utility
APlayerStart* GetFirstRandomUnoccupiedPlayerStart(AController* Controller, const TArray<ALyraPlayerStart*>& FoundStartPoints) const;

LyraPlayerSpawningManagerComponent.cpp