This window shows the errors detected in the current subtitle. It shows the list of errors and suggested actions next to each error. You may leave this window open and continue working in the subtitle editor. In this case if Background Check is enabled in Subtitle Check Options it will automatically update the current error status, if not, it will update when its window is activated. In case of no errors it looks like this:
You can activate or show this window from the Tools menu , Subtitle Check command, or by clicking Detected Errors panel in the Status Bar.