Windows 10 Extend displays

1.   Open Settings.

2.   Click on System.

3.   Click on Display.

4.   Under the "Select and rearrange displays" section, select the monitor that you want to adjust.

5.   Under the "Multiple displays" section, use the drop-down menu to set the appropriate viewing mode:

o    Duplicate desktop — Shows the same desktop on both displays.

o    Extend — Expands the primary desktop to the secondary display.

o    Disconnect this display — Turn off the selected monitor.

After you complete the steps, you may need to repeat steps No. 4 and 5 to set the display mode on the remaining monitors. Also, note that using these settings, you can make any of the monitors as your primary display.