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No worries, the screen should always lock after sleep or idle regardless of SDDM. KDE uses a separate kscreenlocker app for that functionality once your desktop session has started. It’s worth noting the kscreenlocker doesn’t rely on the SDDM theme in any way, as the two are completely separate processes. So, your lock screen will always match your active KDE theme.
No worries, the screen should always lock after sleep or idle regardless of SDDM. KDE uses a separate kscreenlocker app for that functionality once your desktop session has started. It’s worth noting the kscreenlocker doesn’t rely on the SDDM theme in any way, as the two are completely separate processes. So, your lock screen will always match your active KDE theme.