A cabinet is also called a panel. From your picture it looks like you have 30 panels, in 3 rows of 10.
Without knowing how the data cabling has been done its hard to spell out next steps.
You could always unplug the cables one at a time from the back of the processor and see which panels go black. This way you at least know whats wired together.
On the VX6 you can program the screen configuration from the front panel, without using the Novastar software. Alternatively, download SmartLCT - https://www.novastar.tech/products/controller/software/smartlct/
Which is the nicer Novastar software and should be fairly straightforward to understand.
Alternatively, and probably more easily, ask someone who has more experience with LED screens. Happy to help remotely if you want. TeamViewer is so helpful.