Depressurise regulator after game day

Almost all videos on HPA as a whole, indicate that I should be purging my SMR 200 of the air left in it. However when I’ve look up online it seems most people have an easy way to leave the regulator screwed fully on while turning the pressure off. I can’t seem to find a similar feature with this regulator, as lowing the pressure with the screw seems to cause my line hookup side to leek air once I get down below 40psi. For now I’ve been unscrewing the regulator form the bottle then purging it with the line, obviously that works but it doesn’t seem like I’m meant to be screwing and unscrewing the regulator everytime I want to play.

Maybe I’m missing something?