Don't know your screen resolution? See below for instructions.
Click the Apple icon in the top left along your task bar. Go to "System Preferences." Next, click "Displays." Find the list of available resolutions in the box to the left.
Right-click the desktop, click "Screen Resolution." Drag the slider to the recommended location. Click "Apply" then click "OK."
*All photos are open to public doman with appropriate credit:
NPS Photo - Guadalupe Mountains National Park.