On my current Tumbleweed setup, launching the cinnamon Display manager fails
with a missing schema file:

> cinnamon-settings display
> Using pam module (python3-pampy)
> /usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py:424: DeprecationWarning: Gtk.Window.set_wmclass is deprecated
>   self.window.set_wmclass(wm_class, wm_class)
> Loading Display module
> 
> (cinnamon-settings.py:30778): GLib-GIO-ERROR **: 10:09:35.245: Settings schema 'org.cinnamon.control-center.display' is not installed
> Trace/breakpoint trap (core dumped)

A quick search in /usr/share/glib-2.0/schemas reveals that those schema files
are indeed missing:

> ls -l /usr/share/glib-2.0/schemas | grep cinnamon | grep display

Not sure since when this issue is present, might be related to the recent
update to Cinnamon Desktop 5.0?