Mac with 2 monitors, how do i switch virtual desktops on one monitor only? I have 2 monitors for mac, one extended the other.

How do i switch virtual desktops on one monitor only?

For example, When I do 4 fingers swipe left/right on screen1,  I expect the switching happens on screen1 only. 

BUT both monitors will switch virtual desktops at the same time, how do i avoid that?
I am not on a My Mac at the moment, but in the Mission Control Preferences there is a setting to have the spaces work independently. Go to Preferences -> Mission Control -> Displays have separate Spaces.