OK - This looks like this may be my problem…
Name : gnome-control-center-x11-scaling
Version : 41.4-1
Description : GNOME's main interface to configure various aspects of the desktop with X11 fractional scaling patch
Architecture : x86_64
URL : https://gitlab.gnome.org/GNOME/gnome-control-center
Licenses : GPL2
Groups : None
Provides : gnome-control-center
Depends On : accountsservice cups-pk-helper gnome-bluetooth gnome-desktop gnome-online-accounts
gnome-settings-daemon gsettings-desktop-schemas gtk3 libgtop nm-connection-editor
sound-theme-freedesktop upower libpwquality gnome-color-manager smbclient libmm-glib
libgnomekbd libibus libcheese libgudev bolt udisks2 libhandy gsound colord-gtk
Optional Deps : system-config-printer: Printer settings [installed]
gnome-user-share: WebDAV file sharing [installed]
gnome-remote-desktop: screen sharing
rygel: media sharing [installed]
openssh: remote login [installed]
power-profiles-daemon: Power profiles support [installed]
Required By : gnome-calendar
Optional For : gnome-shell
Conflicts With : gnome-control-center
Replaces : None
Installed Size : 21.03 MiB
Packager : Mark Wagie <mark@manjaro.org>
Build Date : Mon 14 Feb 2022 15:12:35 GMT
Install Date : Thu 28 Apr 2022 21:04:45 BST
Install Reason : Explicitly installed
Install Script : No
Validated By : Signature
My Gnome control centre is patched to support fractional scaling. I assume that my problem here is because the gnome-control-center-x11-scaling package hasn’t been updated for Gnome 42 yet and is, therefore, missing the new options (And is probably why I also can’t change my Background as I assume they’ve changed how that works and “Tweaks” is pending an update too)?