Split an ultrawide monitor into three windows - or more

An ultrawide screen is two or three monitors without the bezels, as long as the windows know where to go. Here is how to divide it and fill it in one press.

Doing it by hand

Windows 11 snap layouts offer a few splits when you hover over the maximise button, and on a wide screen they are a start. But the layout is gone the moment one window closes, and every window has to be placed again, one at a time.

A layout for the whole width

Pick a layout: three equal thirds, or halves.
Or draw your own - a wide centre with two narrow sides, for instance: drag a line to split a space in two; it snaps to halves, thirds and the lines you already drew. No gaps, no overlaps.
Fill it with one key: choose what goes in each spot, give the preset a key, and one press opens the apps and lays them out. Press again, and everything goes back.

Good to know

The layout keeps its shape whatever the resolution, so it survives a driver update or a move to another ultrawide.

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