Problem assigning switch to Black Square King Air 350 Ignition/ Starter

Hi.
I’m having problems trying to find the variable assigned to this three-position switch in the Black Square King Air 350
up=starter+ignition
middle=off
down=starter only.
Kind regards.

I can’t figure out how to post a new topic, this site is not user intuitive.
My Black Sq. King Air is glitched with a left eng start switch that the mouse cannot move into “start” . It will only move between the bottom 2 positions.
This is the weirdest thing and I am not a coder. I have no clue how to troubleshoot this problem or guess where it is coming from. But I can’t take off single engine. Please help or tell me HOW to post this problem in the correct place?