From the main page of Display, scroll down to ‘Additional Settings’, ‘Eyefinity’, and select ‘Advanced Setup’:
This will show your displays in a default row. Use ‘Select Layout’ for a different arrangement.
Select the arrangement of the required displays (example: 2 × 2):
You can now drag the displays into the correct locations:
Use the ‘Identify’ button if unsure of the physical correspondence. Then click the red ‘Create’ button to complete the layout.
Page edited [d/m/y]: 20/12/2021