Does any one know it?

If you drag something and hovering your cursor near the margin,the network view slide automatically;

This feature is to me an unwanted,inconvenient,and disrupting feature…………

because of this feature,you can never make the most use of your screen space.
Nodes near the margin can never been comfortably selected by a rectangular selection.

Also auto-alinement is not perfect at all because when you move nodes with network view zoomed out,you can barely notice the auto-alinement.

Regarding auto-scroll, there is not a setting for this now. It is something I've encountered as well, so is a known problem for some workflows. I have submitted RFE 80950 for this.

funny - I want it to auto-scroll when dragging wires

Knziha
Also auto-alinement is not perfect at all because when you move nodes with network view zoomed out,you can barely notice the auto-alinement.

You can adjust the “Snap Radius” in the Edit -> Preferences -> Network Editor dialog. But that radius is (mostly) in node units. It used to be a screen space radius, but that was incredibly annoying because it was almost impossible to not be snapping to something in a large network.

Artye
funny - I want it to auto-scroll when dragging wires

It does auto-scroll when dragging wires, as long as the mouse button stays pressed… Maybe I'm missing something here?

Maybe I turned off a preference - no autoscroll here - see gif.

There are two forms of auto-scroll in H16. In one, if you move your mouse close to the edge of the network editor pane (but still inside the pane), the network view starts panning automatically on a timer. The closer to the edge you are, the faster it pans. Your gif shows you are moving outside the pane, so that form of auto-scrolling won't kick in. This is the form of autoscroll that the OP wants to be able to disable.

The other form occurs when you hit the Space key while dragging outside the bounds of the pane. This feature is just like holding the Alt key in the old network editor, where the mouse is forcibly confined to the network pane, and any attempt to move outside it forces the mouse back into the pane, and pans the network instead. I can't tell if you were holding Space while recording your gif, but I assume not.

So given all that, please try again and let me know if there is still an issue.

oh cool -yep spacebar works. If others can't find that then maybe that pop-up help text could say it.

Thanks!