Go to Device settings on the app in the gang you want to disable, flip the Enable switch to disable the gang.
To hide the gang on the device iotty Light Switch comes with a cardboard. Remove the faceplate and turn it so you can insert the cardboard on the back. Choose which color you prefer to cover the gang and put it face down (we suggest to put the black side face down if you have a dark faceplate color, white side face down if you have a light faceplate color).
Insert the cardboard starting from one short side and parallel to the gangs in the space between the plastic and the glass as shown in the picture. Repeat with the other short side.
Move it on top of the gang you want to hide.