Instructions
Start a game of "Halo: Comat Evolved" by double-clicking on the "Halo" shortcut on your desktop screen.
Click on the "Game Settings" option on the main screen of the game.
Click on the "Screen Resolution" tab to see a list of available screen sizes for "Halo."
Choose a smaller screen size for "Halo" by selecting it from the available drop-down screen resolution list. Click on "Apply Settings" to see what your new screen size looks like.
Click on "Keep Setting" on the pop-up box that follows your screen resolution switch if you like the new screen size. If not, click on the "Go Back" option, and select another screen size. Click on "Main Menu" to exit the settings options and play "Halo" with your new smaller screen size.