Connecteed to secondary computer, but can't see it

Hello - I have successfully installed Multiplicity and set up my secondary computer so that when I scroll to the right of my primary screen, it is supposed to bring up the secondary -but it does not.  I get the pop up that says I am now controlling the secondary computer, but I don't see the home screen of the secondary computer anywhere -my focus screen remains the primary.  Do I have a setting wrong somewhere? -Thanks in advance.