Steve C said:

The side by side option shows 1/4 size windows stacked on top of each other on the left hand side of screen. Why isn't each windows 1/2 the screen size?

I have always had this problem from the first time I used Windows 10 Pro.

Brink said:

I would adventure to guess it's due to Snap.

I've changed all Snap options and it has no effect. Also 'Show windows stacked' is the same as 'Show windows side by side'.

Brink said:

Hello Steve,

I would adventure to guess it's due to Snap.

Well that sucks to. I never use snap, even with snap disabled and restart, it still give blank part of the screen which is crazy in many ways... Oh God.. I don't know what will happen on windows 11 if they kept like this tho

When I try to get "side by side", it never does it right. It usually just stacks them. Or puts them in a "weird" sort of spacing. Never the way it did when I first got the PC. From what I see above in comments, the answer is Cascade because that's what I have to do. Cascade two windows and then reshape them.
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Steve C said:

For two windows, I use the Win key + left arrow one one window then the Win key + right arrow on the other window to place them half size side by side.

Yes but we want it via right click menu on task bar ����. Seems snap ability is why this implemented in the first place, and UWP also. If there're no UWP application launched, snap will work normally, if there's UWP, well.. forget it ��*♂️