Removing the extensions has the same effect.

Block Caribou 36 is necessary as the Point of Sale system (Open source)
already has all the buttons and keyboard that are necessary for the use
of the Point of Sale system. Yet it contains text entry fields which pop
up the on-screen keyboard. There are more touchscreen applications that
tablets, such as Kiosks and Point of Sale systems.

"gsettings set org.gnome.mutter center-new-windows true" is an easter-
egg joke, it puts the windows halfway between the two screens, then
stacks them on top of each other.

"I think this is probably occurring because the primary display is
occupied by a window already. So any more new windows go to the next
display that has empty space. If that's true then this is not a bug. And
hopefully #3 is good enough."

This is a serious bug as the screens are opposing one another. There are two 
different people with two different information goals looking at each screen.
Both screens are occupied by full screen windows. One is the point of sale 
interface for the cashier and the other is the customer display screen showing 
the products the customer is purchasing.

The expected behavior is to put the window on the same monitor to where
the button to open the new window has been pressed.

I'll see if I can muster up some screenshots to make it more visual as
to what is going on.

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You received this bug notification because you are a member of Desktop
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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

Status in gnome-shell package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 20.04 LTS

  gnome-shell:
    Geïnstalleerd: 3.36.3-1ubuntu1~20.04.2

  What I expected to happen:
  When clicking a button on the primary screen to open a new window in any 
application, that window should always open on the same monitor. 

  What happened instead:
  Gnome-shell in Ubuntu 20.04 insists on placing new windows on the secondary 
monitor.

  Why this is a problem:
  My setup are Point of Sale terminals and the primary (a touchscreen) and 
secondary monitors are back to back. When the cashier presses the payment type 
button, the payment type pop-up is opening on the secondary screen which is 
displayed to the customer and not accessible to the cashier who needs to 
complete the transaction. The cashier can't move the pop-up on their own as 
there is no keyboard access (all buttons needed are in the application it 
self), and the touchscreen touches on itself (most of the time).   

  In the past I was able to fix this with devilspie. As this problem has been 
around since Ubuntu 10.04. Was fine in Unity and 16.04/18.04 gnome-shell.
   But now devilspie is ignored by gnome-shell in 20.04 and gnome-shell keeps 
opening all the windows on the secondary screen. 

  I've tried various gnome extensions and gnome-tweaks but none of them
  will open all windows (except the customer display) on the primary
  monitor only.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gnome-shell 3.36.3-1ubuntu1~20.04.2
  ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
  Uname: Linux 5.4.0-40-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.4
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Jul 19 01:21:39 2020
  DisplayManager: gdm3
  InstallationDate: Installed on 2020-07-14 (4 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=nl_NL.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions: mutter-common 3.36.3-0ubuntu0.20.04.1
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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