I do not find how to create "Temp Fence". I do find the option to "Send new (multiple types of items) to this (new) fence."
Also, even when the item is not new, an old item will move and "hid". Sometimes, I can search and find it and sometimes it is easier to "Delete and replace".
I have never mastered the apparently random shuffling within fences and the individual icons not inside a fence. I just live with it. On balance it is a "keeper".
FYI As I have sight problems (two detached retinas), I have changed the screen to a black background, which yields yellow fence names and white item descriptions. It's weird at first, but becomes familiar and is much, much easier to read.