You can only disable a GPU through the miner options under group config!
Under you can find examples for different miners, and all examples will disable GPU2 (the third GPU) in a 6 GPU rig:
TeamRedMiner
--devices=0,1,3,4,5
lolMiner
--devices 0,1,3,4,5
T-rex
--devices 0,1,3,4,5
PhoenixMiner
-gpus 1,2,4,5,6
Gminer
--devices 0,1,3,4,5
NBMiner
-d 0,1,3,4,5
SRBMiner
--gpu-id 0!1!3!4!5
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