I use my hands to kind of do the same thing. It’s probably the behaviour they modeled Monk’s “hand thing” after. It still helps even if I’m searching using my memory and spatial awareness to recall and search through something I am not currently looking at. Somehow, narrowing the scope physically with my hands helps. It’s probably a muscle memory or proprioception thing.
For example, if I want to find something to eat in the fridge. I generally won’t be able to think of anything by just opening the fridge and looking through it. Unless there is something super obvious like a leftover pizza box or something else impossible to miss like that. Just trying to search by looking at each shelf only increases the odds of finding something by like 5%. But when I use my hand and slowly move it down the shelves, I can somehow think more clearly about what is on each shelf than I could without using my hand. And, as I mentioned, it also works even if I am no longer looking in the fridge. I can do it with the door closed and still more clearly recall what was on each shelf.
It also helps when scanning through my whole house looking for something, with and without currently having eyes on it. Like scanning through the whole house room by room while still sitting at my computer, I do a much better job if I am pointing my hand at the place I am thinking about as I scan.
I should probably mention I am Autistic, my spatial awareness and proprioception are two areas I have seemed to benefit. But it’s very easy to get confused or distracted if I have too much information at once. So that is mostly what is going on. I can’t just imagine that I am pointing at something in my imagination to gain the benefit, I have to be literally, physically pointing. Although I can translocate, like not be at my house or fridge and still scan my house or fridge by pointing relatively where each thing would be if they were there.
It’s not limited in scope as far as I can tell. Though it is kind of limited in resolution. The bigger the area I am scanning, the less detail I can recall about it when I am not there, or “looking through walls”. But when I am there, I can go as fine grained as the search demands, just takes longer.