Zones & splits

A zone is a name for a rectangle inside a monitor. You never compute pixels.

Predefined zones

Zone	Rectangle
1A	Left half
1B	Right half
2A	Top-left quarter
2B	Top-right quarter
2C	Bottom-left quarter
2D	Bottom-right quarter

Split zones — N:M

Divide the screen into N equal columns, place the window in column M:

2:1  →  left half          3:1  →  first third
2:2  →  right half         3:2  →  middle third
                           3:3  →  last third

4:3, 5:2 and so on all work — N is not capped at three.

Which monitor?

windowctl move --app "Slack" --zone 1A              # the monitor it is already on
windowctl move --app "Slack" --monitor 2 --zone 1A  # move to display 2, then snap

Omitting --monitor resolves the window’s current monitor by majority overlap — the display holding most of the window’s area, not the one under its top-left corner. That is the difference between “snap it where it is” and “snap it somewhere surprising” for a window straddling two displays.

Exact coordinates, when you need them

windowctl move --title "chrome" --x 0 --y 0 --w 960 --h 1080          # absolute
windowctl move --app "Code" --monitor 2 --x 100 --y 100 --w 800 --h 600  # relative to monitor 2

The rule: coordinates are absolute on their own, and relative to the monitor’s origin when --monitor is present. --w/--h must be > 0.