That's an old bug that's about the workspace previews creeping onto the desktop. It was fixed upstream in https://gitlab.gnome.org/GNOME/gnome- shell/-/issues/517 and is not relevant here.
** Bug watch added: gitlab.gnome.org/GNOME/gnome-shell/-/issues #517 https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/517 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell-extension-ubuntu-dock in Ubuntu. https://bugs.launchpad.net/bugs/1889084 Title: Dock appears on top of windows in overview on a second monitor Status in gnome-shell-extension-ubuntu-dock package in Ubuntu: Triaged Bug description: Steps to reproduce the issue: 1. Attach a second monitor 2. Show the Dock on all monitors from Settings 3. Open many windows in the second monitor 4. Press the Super key for overview See the attached screenshot. What happens: Dock appears on top of windows in overview on a second monitor. What should happen instead: Dock should not appear on top of windows in overview on a second monitor. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: gnome-shell-extension-ubuntu-dock 68ubuntu1~20.04.1 ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44 Uname: Linux 5.4.0-42-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.4 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Mon Jul 27 15:49:50 2020 InstallationDate: Installed on 2020-04-26 (92 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) PackageArchitecture: all ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: gnome-shell-extension-ubuntu-dock UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-ubuntu-dock/+bug/1889084/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
