Open the monitor’s on-screen display (OSD) menu using the physical buttons on the second CRT monitor
Select the size, geometry, or image settings menu
Adjust horizontal size or width
Adjust vertical size or height
Adjust horizontal position to center the image
Adjust vertical position to center the image
Use pincushion, trapezoid, or rotation settings if the image is distorted
Save the settings in the OSD menu if available
Open your computer’s display settings
Select the second monitor
Set the correct resolution for the CRT monitor
Set the refresh rate to a supported value
Use the graphics card control panel to fine-tune display scaling or positioning
Check the monitor cable connection if the image still does not fit correctly
Test different resolutions until the image fills the screen properly