Looks to me like that top left board is one single circuit on a single but very oddly shaped, PCB. If you look closely at it you can see traces crossing between the different sections of the PCB. That said, I'm not sure why you are asking this question. Is this a board you want to reproduce in EasyEDA? Do you have a schematic for it? Does your PCB have to be the same or can the board outline be simplified?

Thanks for the answer. It's not my design, but i'm planning to do something similar. I mean, i think the idea of this designer is to later separate these small boards manually (with a cutter...a dremmel...don't know). Perhaps the lines between the small boards are for testing the whole thing regardless the final use (where these boards will be separated and attached via their connectors) So this was my question. Designer made one schematic, and one PCB. But he made the PCB thinking in separating later these small boards (you can see the strange board outline to help later to break these boards manually. A simple square board would have done quite difficult to separate parts). This was my question. Does multidesign in a pcb board mean that each small board has its own board outline (because it's a different schematic/pcb pair) and it will be supplied as separated board?

If you were to reproduce that PCB then it would be treated as a single PCB. For more information please see: https://easyeda.com/Doc/Tutorial/PCBOrderFAQ

Thanks for the clarification!