I am not certain of this with SH5, but in SH4, the GameplaySettings.cfg file (game / data / cfg folder) holds the info, such as:
[RealismPercentage]
LimitedBatteriesRealismPercentage=4
LimitedCompressedAirRealismPercentage=2
LimitedO2RealismPercentage=4
LimitedFuelRealismPercentage=3
RealisticRepairTimeRealismPercentage=2
ManualTargetingSystemRealismPercentage=24
NoMapUpdateRealismPercentage=16
RealisticSensorsRealismPercentage=4
DudTorpedoesRealismPercentage=2
RealisticReloadRealismPercentage=4
NoEventCameraRealismPercentage=2
NoExternalViewRealismPercentage=9
NoStabilizeViewRealismPercentage=9
MPShowPlayerNamesRealismPercentage=0
MPShowTorpedoesRealismPercentage=0
NoShipHealthBarRealismPercentage=0
NoGunProjectilePathRealismPercentage=0
So if you would post back with the percentage you can actually get, closest to 100%, someone could probably more easily tell you where to look.