On: M1 Macs cannot support dual Extended displays thro...

[kuschku]

Most environments snap windows to borders of logical screens.

If the OS believes the ultrawide is actually two 4:3 monitors, you'll get one such snapping range right in the middle.

If you connect the monitor with one cable, the OS believes it's one single 21:9, but if you connect them with two cables, the OS believes it's two smaller monitors.

[hashhar → kuschku]

Is this true for just MacOS or do Linux (GNOME specifically) and Windows also work the same way?

I don't know anyone with an ultrawide so I can't try this myself.

[kuschku → hashhar]

All of them work like this, but some linux environments and on windows PowerToys Zones support splitting the screen in different, custom ways.

[lozaning → hashhar]

Windows also works this way, IDK about linux. FWIW Samsung's ultra wide monitors are supposed to support splitting the screen up into multiple areas for the purpose of window management, even when using a single cable.