How to make two windows stack to fill the screen

As I recall, in XP/7/8 if you have two windows open and opt to stack them vertically, you get them stacked to fill the screen, each taking 1/2 of the vertical space.

Now with Windows 10 (I'm a late-comer), when I stack two windows, they stack as if there were 3 open windows, leaving the lower 1/3 of the screen showing desktop.

If I try to stack 3 windows (not something I normally use, just checking to see how it functions), I get them tiled 2x2, with the lower right quadrant showing desktop.

With 4 windows, it tiles them in a 2x3 pattern, with 3 tiles on the right, the lower one showing desktop space.

Bizarre.

Anyone know how to fix this? I just want to be able to stack two windows to fill the screen. Is that too much to ask?

Running 20H2, but have seen this on earlier versions, and more than one PC.

Very slick, thanks. Fancy Zones looks like it will do the trick, and the Shortcut piece is nice too. Had tried Snap before but never got the hang of it. - looks like it doesn't do stacking, just side by side, unless I'm missing something.

The old stack option did have problems with some 3rd party software, but was otherwise pretty useful. Glad someone fixed the Windows 10 corruption of it.

Side by side works fine. Stacking is the one that no longer works the same in W10.

Voila, that worked, turning off Multi-tasking. Oddly, after reboot, the first time I tried it, with two Firefox windows, it did the thirds thing again, but now with FF, Windows Explorer, and even MSOutlook open, I get the proper half-screen stacking of two maximized windows, even with other windows open but minimized.