> This is interesting. When running gnome-shell in Wayland the window
placement seems to be correct. I've been testing it a bit.

I think that's what I was aiming for with:

  gsettings set org.gnome.mutter center-new-windows true

It likely works better in Wayland because that treats each monitor
separately. Whereas Xorg likes to render all monitors as one, so the
middle might be the border between the monitors.

> Unfortunately Wayland doesn't allow for remote desktop access so I
can't help my customers when something goes wrong.

Please subscribe to bug 1696885 about that. It is blocked by bug
1802533.

> https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3011

Excellent, thanks.

> Do you have any recommendations for an alternative window manager

Canonical doesn't support anything other than Gnome Shell now. Though as
you have found even that "support" has its limitations.

I suggest any software that wants a window A to reliably appear over
window B should make sure window A is a dialog parented by B, or that A
is a modal dialog parented by B. So if you can get that small change
made to the POS software then it should work correctly with most window
managers including gnome-shell.

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https://bugs.launchpad.net/bugs/1888098

Title:
  Ubuntu 20.04 gnome-shell places windows on second screen when started
  from primary screen

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