Here is a desktop recording showing the problem.

Note: The screen recorder concatenates both monitors into one "super
sized" rectangle.  The primary monitor is the left half and the
secondary monitor is the right half, with no visible separation.   When
icons appear on the 2nd monitor they show just to the right of the
center of the recorded image.

For this vidwo I set the resolutions of both monitors to be similar, but
you can see a narrow black rectangle under the primary monitor because
it is set to slightly smaller vertical dimension than the other monitor.
The primary mon is 1920x1080 and the 2nd monitor was 1920x1200 (it's
native res).

** Description changed:

  In Settings->Desktop : Desktop Layout
  With "Show icons on all monitors" then icons only appear on the primary
  With "Show icons on non-primary monitor(s) only" the icons do appear on
- the 2nd monitor as expected.  This shows that the 2nd monitor is
- recognized (besides, I can see the Cinnamon desktop image on the 2nd
- monitor).
+ the 2nd monitor **but only** if "Show icons from missing monitors" is
+ checked (!)
+ I'm not sure what "missing monitor" means.  My graphics card has 3
+ outputs (2xHDMI, 1 DP) and I'm using two of them, so there is an unused
+ output which might be called a "missing monitor".   Anyway, I don't
+ think that checking this option should have any effect on whether icons
+ are ever shown on the second monitor (which is connected and working,
+ not missing).
+ The "show on all monitors" option only ever shows icons on the primary
+ monitor, whether or not the 'missing monitors' option is checked.
  The monitors are different resolutions, if that matters.
  Primary (which is monitor #2, I guess because of the port being used): 
  Second (monitor #1): 1920 x 1200.
  "Join Displays" is selected.
+ I tried "Reset to Default" in Settings->Display->Layout but it didn't help.
- I tried "Reset to Default" in Settings->Display->Layout but it didn't help.
+ I'll attach a desktop recording showing the problem.
  ProblemType: Bug
  DistroRelease: Ubuntu 23.04
  Package: cinnamon 5.6.7-1
  ProcVersionSignature: Ubuntu 6.2.0-26.26-generic 6.2.13
  Uname: Linux 6.2.0-26-generic x86_64
  ApportVersion: 2.26.1-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: X-Cinnamon
  Date: Fri Jul 28 15:48:06 2023
  InstallationDate: Installed on 2023-07-26 (2 days ago)
  InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Release amd64 (20230417)
  SourcePackage: cinnamon
  UpgradeStatus: No upgrade log present (probably fresh install)

** Attachment added: "show_icons_both_mons_not_working.mp4"

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  "Show desktop icons on all monitors" does not work

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