Two ways. Either -
In the camera settings, select one of the other tabs at the top. (vr object or vr scene) The cameras will disappear until you switch back to the camera tab.
Or,
Create a new path called 'blank' with no cameras on. Switch to this when you want the other cameras to disappear, select the original path when you want the cameras back again or to add new ones.
You can also create several different paths to store different 'groups' of cameras used for a particular purpose. eg internal renders, external renders, photomontages, walk-through 1, walk-through 2 etc etc.