Scroller and ajax data length value

recew

Hi everyone!
I use datatables with this options:
"serverSide": true, "ajax": "/users/table", "scroller": { "loadingIndicator": true }, "deferRender": true, dom: "frtiS", ordering: false, "scrollY": 300,

How do I can change the length parameter which send by ajax to server? In my case its always 81.
More details in attached screenshot.

recew

I find solution. Just need to set displayBuffer parameter:

"scroller": {
                    "loadingIndicator": true,
                    "displayBuffer": 2
                },