How to modify printer dimensions?

Step 1: Go to your ‘‘Slice’’ settings.

Step 2: Select the ‘‘Expert Tab’’ and find the line -
“posx”: “0”,
“posy”: “0”,

Step 3: Make your changes and feel free to save them!

I am understanding it so. 110000=11cm. It’s half of bed Anet A8 printer. When my printer x max and y max is 200000 (20cm), I will set value on 100000 (10cm) on X and Y axis, which is half and center of my printer’s bed.
I don’t know if is it so with each of the printer. I must try it if is it right.