Even though we have the screenshot thumbnail for each SDDM theme, it would be handy to have a test button in KCM to run the command: $ sddm-greeter --test-mode --theme /usr/share/sddm/themes/breeze/ This concept already exists for the Plasma Splashscreens. Thank you
I agree. It will probably have to wait for the KCM rewrite though.
*** This bug has been marked as a duplicate of bug 418174 ***