Minecraft Version: 1.16.5
forge: 36.0.13
Version: ExtremeReactors-1.16.4-2.0.21
ZeroCore Version: ZeroCore2-1.16.4-2.0.19

Sorry, me again.
In the language file I see this description
"gui.bigreactors.reactor.redstoneport.sensortype.inputsetcontrolrod.settolevel": "Set the Control Rod insertion level based on the strength of the signal (0 = 0% and 15 = 100%)",
I check the code, It doesn't seem to be used.
In the picture it should be here

No problems, the feedback is welcome

Yeah that language key is not used. All others behaviors have sub-settings that goes in that red square but not the control rod insertion sensor