The part of the Gnome documentation in RHEL 10 for customizing compose key settings for all users contains '*' in several CLI examples for some reason.
See https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/10/html-single/using_the_gnome_desktop_environment/index#enabling-the-compose-key-for-all-users

$ *grep compose /usr/share/X11/xkb/rules/evdev.lst*

and

# *dconf update*