There are no periods for the rest of the day
Schedules can send notifications alerting you when there are certain times left in the period (see the settings for more details), but this requires the tab staying open.
One suggestion is to pin the tab (right-click on the tab, and click "Pin Tab").
Schedules cannot currently sync settings automatically (this is coming soon though, stay tuned!), but does have a way to manually sync them. Open settings, then click the download icon to export, and the upload icon to import.