Public bug reported:
Bug summary
-----------
In "gnome-control-center" (aka "Settings" application) there are two selectable
Appearance Styles: "Default" and "Dark".
For most applications "Default" style acts as a "Light" style, as
opposite to the other selectable style: "Dark".
For instance "Settings" or "Papers" applications are shown with white
background when "Default" style is selected but with black background
when "Dark" style is selected. It's in fact that way for almost any
other applications.
But "Loupe" is shown with black background always. So no white
background is shown for "Default" style broken the applications
uniformity.
Workaround
----------
"gnome-control-center" ("Settings") only allow to select between "Default" and
"Dark" styles but it's corresponding gsettings key (org.gnome.desktop.interface
color-scheme) allow three values: "default", "prefer-dark" and "prefer-light".
The assignation is:
"gnome-control-center Default" -> org.gnome.desktop.interface color-scheme ->
default
"gnome-control-center Dark" -> org.gnome.desktop.interface color-scheme ->
prefer-dark
So, there is no way to select org.gnome.desktop.interface color-scheme
prefer-light using "gnome-control-center". But if prefer-light is
manually set "Loupe" shows its white background as expected.
Additional info
---------------
# lsb_release -rd
Description: Ubuntu 25.10
Release: 25.10
# # apt-cache policy loupe
loupe:
Instalados: 49.0-1ubuntu1
Candidato: 49.0-1ubuntu1
Tabla de versión:
*** 49.0-1ubuntu1 500
500 http://ports.ubuntu.com/ubuntu-ports questing/main arm64 Packages
100 /var/lib/dpkg/status
** Affects: loupe (Ubuntu)
Importance: Undecided
Status: New
** Tags: gnome-control-center loupe
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https://bugs.launchpad.net/bugs/2134319
Title:
[Ubuntu 25.10 Questing] Loupe application doesn't follow system
appearance style
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