How to Set Individual Background Image on Each Monitor
Available in: Actual Window Manager, Actual Multiple Monitors.
Open the configuration window of the software.
Go to the Multiple Monitors tab and open the Background property sheet.
Find and check the “Individual picture on each monitor” box.
Select the desired picture in the “Picture file” field and set the desired wallpaper position in the appropriate field.
Repeat above actions for the other monitors.
Apply your adjustments.