This feature allows you to temporarily override all other playlists on the screen. When the schedule for a playlist with this option selected is active, no other playlists will be shown on the screen until the schedule ends (or manually disabled). At the end of the scheduled time, the screen will automatically revert back to showing its regular playlist content.
This feature works well to display a short-term emergency message or alert. If you configure more than one playlist with priority override enabled, then all of these will play on the screen consecutively.
To enable priority override, go to the Playlists page, select your playlist, click on the Advanced section, then enable the Priority Override option. Once complete, be sure to save your playlist changes.