here is what you want:
FEnhancedInputActionValueBinding MoveActionBinding = EnhancedInputComponent->BindActionValue(IA_Move);
const FVector2D MoveInputVector = MoveActionBinding.GetValue().Get<FVector2D>();
float MoveInputLength = UKismetMathLibrary::VSize2D(MoveInputVector);
FEnhancedInputActionValueBinding WorldSpaceMoveActionBinding = EnhancedInputComponent->BindActionValue(IA_Move_WorldSpace);
const FVector2D WorldSpaceMoveInput = WorldSpaceMoveActionBinding.GetValue().Get<FVector2D>();