Under Screen Resolution (or Desktop Area), drag the slider to the required size.
Note that Cadzow 2000 requires a minimum of 800 by 600 pixels, but it will resize at higher resolutions.
Some computers/monitors cannot display all resolutions, even if they are offered as an option. If you wish to make the resolution higher, try making it higher by one step at a time.
If, after changing the resolution, the screen is unreadable, wait 20 seconds. Windows will revert the display back to the original settings if it does not receive a confirmation from you that the display is correct.