Split View isn't working

A force click should not be necessary(merely a LONG left click on the green button). In order to better help you, Can you please tell me what apps you are trying to use Split View with?

Please be aware that some application developers have not coded their Apps for Split View yet.. thus certain apps will not have compatibility with this feature yet. This can be tested.. if you ONLY hover your cursor over the green button(typically used for Window Resizing, or Full Screen), if it shows a + then typically(my experience) the app does not support Split View yet. Also keep in mind that the windows you wish to split view with must be open BEFORE trying to utilize Split View.

I hope this helps.. please let me know if there are any points I need to clarify..

 

All current apps should work in split view... it's not doing anything special other that siding the app in half. just move your mouse cursor to the maximize (green) icon click and hold. Try it with Safari to get use to it.

 

Make sure you have turned on "Displays have separate Spaces" in System Preferences > Mission Control.
Without that flag checked, Split View will not work!
PS Actually, I found that solution in this very forum!

 

Are you running El Capitan? I also got a new MacBook recently and, being new to OS X, initially thought El Capitan was installed after running the listed system updates in the App Store, but they were Yosemite updates.