How to enable / troubleshoot split view? I have just installed El Capitan on my MacBook Pro 13 mid 2012

I can't get split view to work either via the mission control method or the green button one. 

Does anybody know this is supposed to work?
This was driving me crazy as well. Go to System Preferences -> Mission Control and make sure that ‘Displays have separate Spaces’ is checked. You’ll have to log out and log back in for the change to take affect. That fixed it for me.