Stop a particular GPU in a rig

I am an absolute newbie. I wish to know how to stop my second gpu (gpu1) from mining without switching off the rig. I am using nanominer and the card is GTX 1070.

hi just unset your flight sheet for the worker and then amend miner you are using to specify which GPU to use only

obviously DONT’T remove the stopped GPU physcially from the pcie etc whilst rig is powered up