How to set the screen split position per virtual desktop?

On KDE Plasma 5.27 (X11), how do I set the screen split position per virtual desktop? When I do this,

1. Switch to the 1^st^ virtual desktop
2. Drag two windows to the left and the right edges of the display, respectively
3. Switch to the 2^nd^ virtual desktop
4. Drag two windows to the left and the right edges of the display, respectively
5. Adjust the split position from 1:1 to, say, 3:1
6. Switch to the 1^st^ virtual desktop

The split position on the 1^st^ virtual desktop is also affected. How do I make it so that different virtual desktops have different split positions?