Hi! I have THC control on my plasma torch. It works good
but sometimes i would like to disable it in an easy way when i
read reference arc voltage for new materials.
I have a THC ON/OFF button in the gui, but that doesnt seem
to do anything. Everytime i must go without THC i disable all the
THC inputs in "ports and pins" but it feels like there should be an easier
Way to Temporary disable the THC logic?

i disable thc by using a dpdt relay controlled thru an mcode. that will break the connection to your breakout board. i use m8 to turn on the relay which disables the thc. m9 turns off the relay which enables thc signal to the breakout board. create a button for your screen and click on for thc off or on. you can turn off and on in your gcodes. turn off for cutting small holes . works well for me . you can also add a simple joystick to the relay terminals and use it to control height manually with  thc turned off.