Download software first!
To set up 4-split screen on your monitor, you have to download the relevant software.
Download software / firmware
Follow the link above or visit lg.com/uk → Support → 'Software & Firmware' → then type in your model number (e.g. UC97 or UM57).
After downloading the software.
You will usually have to restart your PC/Mac.
When you run the software, it will provide you a list of options to select from.
Select '4 Screen (balanced)' for 4 way screen split function. You can go upto 8 screens.
If you need any further support, please contact LG Customer Support here.