Well that was insightful. The behavior seems to be connected with the option, "Displays have separate Spaces." I guess it makes sense that OS X might have some indigestion figuring out how to split half a page onto "Desktop 2" and the other half onto "Desktop 7."
When I turned it off, I was able to split a window between two displays, mostly (if I dragged more than about half of it onto the lower display, it snapped entirely to that display, but I could drag it back upwards and get it to stick). But I couldn't grow it to encompass more than one display, no matter what I did, which I can achieve trivially under Windows (on the Mac). But in that mode, the machine was operationally lobotomized. When you flip to a different desktop on one display to double-check a piece of data, the data you needed to compare it to on the lower display flips away from you. Maybe I'm just too used to working in the "independent displays" mode, but that was a non-starter for me, so I won't be using it. But thanks for clearing up my question. > On Oct 31, 2021, at 2:58 PM, Robert Zusman <[email protected]> wrote: > > I suspect that may have something to do with it. > My Mojave system splits windows just fine (the left monitor stops just after > the “send mail” button): > > -RZ > >> On Oct 31, 2021, at 2:54 PM, Macs R We <[email protected] >> <mailto:[email protected]>> wrote: >> >> Well, I'm using "multiple Desktops" in Mission Control, which superseded the >> original Spaces. >> >>> On Oct 31, 2021, at 2:43 PM, Robert Zusman <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> Are you using “Spaces?” >>> >>> -RZ >>> >>>> On Oct 31, 2021, at 2:36 PM, Macs R We <[email protected] >>>> <mailto:[email protected]>> wrote: >>>> >>>> I run a two-display system on my bench, with one display (wall mount) >>>> positioned over the other (laptop). >>>> >>>> When I was running Windows recently in Parallels (which picks up that >>>> there are two screens and uses them), I noticed that if I dragged a screen >>>> halfway between the two displays, it stayed there just fine, split between >>>> displays. Or, I could grow a screen to encompass both displays, giving me >>>> stuff like extra-long browser windows or galley copies. >>>> >>>> It triggered a long-ago memory of being able to do exactly this on the >>>> Mac, in the classic OS. But I can't do it today. >>>> >>>> If I try to drag a window halfway between two monitors, it will show a >>>> "ghost" copy of the bottom of the window on the lower screen until I >>>> release the window, then only the upper half of the window will show, on >>>> the upper screen. (If the displays are arranged side-by-side, a similar >>>> thing happens, with the partial window available only on the leftmost >>>> screen.) >>>> >>>> This has resulted numerous times in a "lost window" syndrome, where I move >>>> a window slightly to the left or right, but inadvertently manage to >>>> fat-finger it upwards as well. Suddenly the whole window vanishes, save >>>> for a sliver on the upper screen that is near invisible, hidden by the >>>> Dock, or whatever. Where did my window go? Mission Control shows it as >>>> still existing, but it disappears again when I click on it. Maddening. >>>> >>>> Anyway, my question is, is there a setting I am overlooking somewhere on >>>> the Mac that would allow the old split-display rendering? Obviously, there >>>> is no technical reason it can't be done under OS X, because WIndows does >>>> it running under Parallels under OS X. >>>> >>>> --
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