You do mean the no-start-in-gear switch in the control housing.
Depends on you brand of control, most are non adjusable. What seem to be the problem with it?
I have to move the lever aft of neutral while holding the key in the start position and wiggle the handle around until I find that one spot which will activate the starter. It's a big PITA, Most boats you just let it pop in neutral and the starter works.