Block Quick Look During Downtime

According to System Preferences, the Downtime feature of Screen Time "[s]ets a schedule for time away from the screen. During downtime, only apps that you choose to allow and phone calls will be available." Downtime blocks most apps, but it does not block Finder. It blocks the Quick Look feature of Finder for video but not audio or PDF. How can I block Quick Look for all file types during downtime? Alternatively, can I force a log out during downtime? As I recall, the Restrictions feature that preceded Screen Time could force a log out. If Screen Time cannot do this, then what parental control apps can?