To figure out why your computer isn’t recognizing your external monitor’s resolution settings, please follow these steps:

1. Make sure the cables connecting the monitor to the computer are properly connected.
2. Reboot your computer.
3. Update your graphics card driver:
   • Go to Device Manager.
   • Expand Display Adapters.
   • Right-click your graphics card and select Update Driver.
4. If the above steps do not resolve the issue, try switching out the cables.
5. If the issue still persists, try a different port on your computer.