Quote Originally Posted by sabana View Post
Just found out that on the first scenario you can't. This feature is only enabled from act 2 onwards. Hope this helps anyone else wondering why this is.

Sab
No, it works in the first scenario too: just make sure your options are set to 'total war setup' for keys. There were times, when my zoom stopped working in my campaign. Checking options, I discovered the game had reset the controls to some other layout (not Total War); resetting the options fixed the zoom.