Moving mouse to second monitor

While I’m in the menus of SCII or on the battle.net window I can move my mouse freely between monitors but as soon as I actually launch the campaign my mouse becomes locked. Is there a way to fix this? I’ve tried running windowed mode in both ways and it doesn’t fix the problem. I’m running a MacBook Pro if that helps.

I believe there is an option to lock the mouse to the screen somewhere.

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Confine mouse cursor!! Thank you!