Clicking the themes in control center does change the gtk-theme setting. It only does not modify anything layout-wise :)
$ dpkg -l | grep yaru ii yaru-theme-gnome-shell 20.04.10.1 all Yaru GNOME Shell desktop theme from the Ubuntu Community Original setting: $ gsettings get org.gnome.desktop.interface gtk-theme 'Ambiance' After clicking on light layout: $ gsettings get org.gnome.desktop.interface gtk-theme 'Yaru-light' After clicking on standard layout: $ gsettings get org.gnome.desktop.interface gtk-theme 'Yaru' After clicking on dark layout: $ gsettings get org.gnome.desktop.interface gtk-theme 'Yaru-dark' -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1926088 Title: Appearance: Window colors selection does not work Status in gnome-control-center package in Ubuntu: Incomplete Bug description: When clicking on one of the "window colors" (Light, Standard, Dark) in the Appearance section of gnome control center, nothing changes. The window background stays light, the top window bar stays light. Using gnome tweaks tool to change the appearance works, and then changing the "window colors" once works (sets colors back to default). All further color changes do not work. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: gnome-control-center 1:3.36.5-0ubuntu1 ProcVersionSignature: Ubuntu 5.4.0-72.80-generic 5.4.101 Uname: Linux 5.4.0-72-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.16 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Sun Apr 25 18:17:33 2021 InstallationDate: Installed on 2013-11-29 (2703 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) ProcEnviron: LANGUAGE=de_DE PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: gnome-control-center UpgradeStatus: Upgraded to focal on 2021-04-25 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1926088/+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