When playing the game, the display may appear too large on the screen. 

To correct the issue, press the Alt + Enter key on your keyboard to switch to a mode that is smaller.

If the game window appears too small for your preference, use your display settings manager in your operating system to reduce the resolution until the display window is appropriate for your viewing preference. 

Windows 7: https://support.microsoft.com/en-us/help/14108/windows-7-change-screen-resolution 

Windows 8.1: Right click on an empty space on the desktop and select "Personalize". Then, adjust the slider for the resolution for a lower setting until you can see the game display fine. 

Windows 10: https://support.microsoft.com/en-us/help/4026956/windows-10-change-screen-resolution