Hi
In Origin, right-click the SimCity icon and choose "Game Properties" > click the "Advanced Launch Options" tab > type "-w" (without the quotation marks) in the "Command Line Arguments" box. Launch SimCity and go to the Settings menu (upper right three dots). Choose the correct resolution for your screen in the graphics settings.
Are you on a Mac? Please check this post: https://answers.ea.com/t5/SimCity-2013/Mac-Mouse-Cursor-and-Display-Resolution-Problems/m-p/7839105#M127554 If your issue is the same, click "Me Too" on the first post, and add your system details to the thread. Happy Building!