You seem to confuse snapping and tiling.
Window snapping happens when you carry a window to very edge of the screen and it fills that half of the screen.
Window tiling is displaying every window in a workspace in a grid like fashion.
If there is only 1 window, it fills entire screen.
When we open 1 more window, 2 windows take half of the screen and not overlap.
TWM avoids overlapping and utilizes entire screen space by resizing every window automatically.
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