隐藏第二个列表中的元素[英]Hide elements in second list

On my page, there are two dropdown lists. What I want to do is hide an element in one list if the mirroring option is selected in the other list. It's pretty much running exactly how I want it right now, except for the fact that it hides elements in its own list and not the other list.On my page, there are two dropdown lists. What